Update clang, llvm, lld, lldb, compiler-rt and libc++ to 4.0.0 release:

MFC r309142 (by emaste):

Add WITH_LLD_AS_LD build knob

If set it installs LLD as /usr/bin/ld.  LLD (as of version 3.9) is not
capable of linking the world and kernel, but can self-host and link many
substantial applications. GNU ld continues to be used for the world and
kernel build, regardless of how this knob is set.

It is on by default for arm64, and off for all other CPU architectures.

Sponsored by:	The FreeBSD Foundation

MFC r310840:

Reapply 310775, now it also builds correctly if lldb is disabled:

Move llvm-objdump from CLANG_EXTRAS to installed by default

We currently install three tools from binutils 2.17.50: as, ld, and
objdump. Work is underway to migrate to a permissively-licensed
tool-chain, with one goal being the retirement of binutils 2.17.50.

LLVM's llvm-objdump is intended to be compatible with GNU objdump
although it is currently missing some options and may have formatting
differences. Enable it by default for testing and further investigation.
It may later be changed to install as /usr/bin/objdump, it becomes a
fully viable replacement.

Reviewed by:	emaste
Differential Revision:	https://reviews.freebsd.org/D8879

MFC r312855 (by emaste):

Rename LLD_AS_LD to LLD_IS_LD, for consistency with CLANG_IS_CC

Reported by:	Dan McGregor <dan.mcgregor usask.ca>

MFC r313559 | glebius | 2017-02-10 18:34:48 +0100 (Fri, 10 Feb 2017) | 5 lines

Don't check struct rtentry on FreeBSD, it is an internal kernel structure.
On other systems it may be API structure for SIOCADDRT/SIOCDELRT.

Reviewed by:	emaste, dim

MFC r314152 (by jkim):

Remove an assembler flag, which is redundant since r309124.  The upstream
took care of it by introducing a macro NO_EXEC_STACK_DIRECTIVE.

http://llvm.org/viewvc/llvm-project?rev=273500&view=rev

Reviewed by:	dim

MFC r314564:

Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
4.0.0 (branches/release_40 296509).  The release will follow soon.

Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.

Also note that as of 4.0.0, lld should be able to link the base system
on amd64 and aarch64.  See the WITH_LLD_IS_LLD setting in src.conf(5).
Though please be aware that this is work in progress.

Release notes for llvm, clang and lld will be available here:
<http://releases.llvm.org/4.0.0/docs/ReleaseNotes.html>
<http://releases.llvm.org/4.0.0/tools/clang/docs/ReleaseNotes.html>
<http://releases.llvm.org/4.0.0/tools/lld/docs/ReleaseNotes.html>

Thanks to Ed Maste, Jan Beich, Antoine Brodin and Eric Fiselier for
their help.

Relnotes:	yes
Exp-run:	antoine
PR:		215969, 216008

MFC r314708:

For now, revert r287232 from upstream llvm trunk (by Daniil Fukalov):

  [SCEV] limit recursion depth of CompareSCEVComplexity

  Summary:
  CompareSCEVComplexity goes too deep (50+ on a quite a big unrolled
  loop) and runs almost infinite time.

  Added cache of "equal" SCEV pairs to earlier cutoff of further
  estimation. Recursion depth limit was also introduced as a parameter.

  Reviewers: sanjoy

  Subscribers: mzolotukhin, tstellarAMD, llvm-commits

  Differential Revision: https://reviews.llvm.org/D26389

This commit is the cause of excessive compile times on skein_block.c
(and possibly other files) during kernel builds on amd64.

We never saw the problematic behavior described in this upstream commit,
so for now it is better to revert it.  An upstream bug has been filed
here: https://bugs.llvm.org/show_bug.cgi?id=32142

Reported by:	mjg

MFC r314795:

Reapply r287232 from upstream llvm trunk (by Daniil Fukalov):

  [SCEV] limit recursion depth of CompareSCEVComplexity

  Summary:
  CompareSCEVComplexity goes too deep (50+ on a quite a big unrolled
  loop) and runs almost infinite time.

  Added cache of "equal" SCEV pairs to earlier cutoff of further
  estimation. Recursion depth limit was also introduced as a parameter.

  Reviewers: sanjoy

  Subscribers: mzolotukhin, tstellarAMD, llvm-commits

  Differential Revision: https://reviews.llvm.org/D26389

Pull in r296992 from upstream llvm trunk (by Sanjoy Das):

  [SCEV] Decrease the recursion threshold for CompareValueComplexity

  Fixes PR32142.

  r287232 accidentally increased the recursion threshold for
  CompareValueComplexity from 2 to 32.  This change reverses that
  change by introducing a separate flag for CompareValueComplexity's
  threshold.

The latter revision fixes the excessive compile times for skein_block.c.

MFC r314907 | mmel | 2017-03-08 12:40:27 +0100 (Wed, 08 Mar 2017) | 7 lines

Unbreak ARMv6 world.

The new compiler_rt library imported with clang 4.0.0 have several fatal
issues (non-functional __udivsi3 for example) with ARM specific instrict
functions. As temporary workaround, until upstream solve these problems,
disable all thumb[1][2] related feature.

MFC r315016:

Update clang, llvm, lld, lldb, compiler-rt and libc++ to 4.0.0 release.
We were already very close to the last release candidate, so this is a
pretty minor update.

Relnotes:	yes

MFC r316005:

Revert r314907, and pull in r298713 from upstream compiler-rt trunk (by
Weiming Zhao):

  builtins: Select correct code fragments when compiling for Thumb1/Thum2/ARM ISA.

  Summary:
  Value of __ARM_ARCH_ISA_THUMB isn't based on the actual compilation
  mode (-mthumb, -marm), it reflect's capability of given CPU.

  Due to this:
   - use  __tbumb__ and __thumb2__ insteand of __ARM_ARCH_ISA_THUMB
   - use '.thumb' directive consistently  in all affected files
   - decorate all thumb functions using
     DEFINE_COMPILERRT_THUMB_FUNCTION()

  ---------
  Note: This patch doesn't fix broken Thumb1 variant of __udivsi3 !

  Reviewers: weimingz, rengolin, compnerd

  Subscribers: aemerson, dim

  Differential Revision: https://reviews.llvm.org/D30938

Discussed with:	mmel

1 files changed, 0 insertions, 310 deletions

diff --git a/contrib/llvm/lib/DebugInfo/PDB/Raw/MappedBlockStream.cpp b/contrib/llvm/lib/DebugInfo/PDB/Raw/MappedBlockStream.cpp
deleted file mode 100644
index 92b2048..0000000
--- a/contrib/llvm/lib/DebugInfo/PDB/Raw/MappedBlockStream.cpp
+++ /dev/null
@@ -1,310 +0,0 @@
-//===- MappedBlockStream.cpp - Reads stream data from a PDBFile -----------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/DebugInfo/PDB/Raw/MappedBlockStream.h"
-#include "llvm/DebugInfo/PDB/Raw/DirectoryStreamData.h"
-#include "llvm/DebugInfo/PDB/Raw/IPDBStreamData.h"
-#include "llvm/DebugInfo/PDB/Raw/IndexedStreamData.h"
-#include "llvm/DebugInfo/PDB/Raw/PDBFile.h"
-#include "llvm/DebugInfo/PDB/Raw/RawError.h"
-
-using namespace llvm;
-using namespace llvm::pdb;
-
-namespace {
-// This exists so that we can use make_unique while still keeping the
-// constructor of MappedBlockStream private, forcing users to go through
-// the `create` interface.
-class MappedBlockStreamImpl : public MappedBlockStream {
-public:
-  MappedBlockStreamImpl(std::unique_ptr<IPDBStreamData> Data,
-                        const IPDBFile &File)
-      : MappedBlockStream(std::move(Data), File) {}
-};
-}
-
-typedef std::pair<uint32_t, uint32_t> Interval;
-static Interval intersect(const Interval &I1, const Interval &I2) {
-  return std::make_pair(std::max(I1.first, I2.first),
-                        std::min(I1.second, I2.second));
-}
-
-MappedBlockStream::MappedBlockStream(std::unique_ptr<IPDBStreamData> Data,
-                                     const IPDBFile &Pdb)
-    : Pdb(Pdb), Data(std::move(Data)) {}
-
-Error MappedBlockStream::readBytes(uint32_t Offset, uint32_t Size,
-                                   ArrayRef<uint8_t> &Buffer) const {
-  // Make sure we aren't trying to read beyond the end of the stream.
-  if (Size > Data->getLength())
-    return make_error<RawError>(raw_error_code::insufficient_buffer);
-  if (Offset > Data->getLength() - Size)
-    return make_error<RawError>(raw_error_code::insufficient_buffer);
-
-  if (tryReadContiguously(Offset, Size, Buffer))
-    return Error::success();
-
-  auto CacheIter = CacheMap.find(Offset);
-  if (CacheIter != CacheMap.end()) {
-    // Try to find an alloc that was large enough for this request.
-    for (auto &Entry : CacheIter->second) {
-      if (Entry.size() >= Size) {
-        Buffer = Entry.slice(0, Size);
-        return Error::success();
-      }
-    }
-  }
-
-  // We couldn't find a buffer that started at the correct offset (the most
-  // common scenario).  Try to see if there is a buffer that starts at some
-  // other offset but overlaps the desired range.
-  for (auto &CacheItem : CacheMap) {
-    Interval RequestExtent = std::make_pair(Offset, Offset + Size);
-
-    // We already checked this one on the fast path above.
-    if (CacheItem.first == Offset)
-      continue;
-    // If the initial extent of the cached item is beyond the ending extent
-    // of the request, there is no overlap.
-    if (CacheItem.first >= Offset + Size)
-      continue;
-
-    // We really only have to check the last item in the list, since we append
-    // in order of increasing length.
-    if (CacheItem.second.empty())
-      continue;
-
-    auto CachedAlloc = CacheItem.second.back();
-    // If the initial extent of the request is beyond the ending extent of
-    // the cached item, there is no overlap.
-    Interval CachedExtent =
-        std::make_pair(CacheItem.first, CacheItem.first + CachedAlloc.size());
-    if (RequestExtent.first >= CachedExtent.first + CachedExtent.second)
-      continue;
-
-    Interval Intersection = intersect(CachedExtent, RequestExtent);
-    // Only use this if the entire request extent is contained in the cached
-    // extent.
-    if (Intersection != RequestExtent)
-      continue;
-
-    uint32_t CacheRangeOffset =
-        AbsoluteDifference(CachedExtent.first, Intersection.first);
-    Buffer = CachedAlloc.slice(CacheRangeOffset, Size);
-    return Error::success();
-  }
-
-  // Otherwise allocate a large enough buffer in the pool, memcpy the data
-  // into it, and return an ArrayRef to that.  Do not touch existing pool
-  // allocations, as existing clients may be holding a pointer which must
-  // not be invalidated.
-  uint8_t *WriteBuffer = static_cast<uint8_t *>(Pool.Allocate(Size, 8));
-  if (auto EC = readBytes(Offset, MutableArrayRef<uint8_t>(WriteBuffer, Size)))
-    return EC;
-
-  if (CacheIter != CacheMap.end()) {
-    CacheIter->second.emplace_back(WriteBuffer, Size);
-  } else {
-    std::vector<CacheEntry> List;
-    List.emplace_back(WriteBuffer, Size);
-    CacheMap.insert(std::make_pair(Offset, List));
-  }
-  Buffer = ArrayRef<uint8_t>(WriteBuffer, Size);
-  return Error::success();
-}
-
-Error MappedBlockStream::readLongestContiguousChunk(
-    uint32_t Offset, ArrayRef<uint8_t> &Buffer) const {
-  // Make sure we aren't trying to read beyond the end of the stream.
-  if (Offset >= Data->getLength())
-    return make_error<RawError>(raw_error_code::insufficient_buffer);
-  uint32_t First = Offset / Pdb.getBlockSize();
-  uint32_t Last = First;
-
-  auto BlockList = Data->getStreamBlocks();
-  while (Last < Pdb.getBlockCount() - 1) {
-    if (BlockList[Last] != BlockList[Last + 1] - 1)
-      break;
-    ++Last;
-  }
-
-  uint32_t OffsetInFirstBlock = Offset % Pdb.getBlockSize();
-  uint32_t BytesFromFirstBlock = Pdb.getBlockSize() - OffsetInFirstBlock;
-  uint32_t BlockSpan = Last - First + 1;
-  uint32_t ByteSpan =
-      BytesFromFirstBlock + (BlockSpan - 1) * Pdb.getBlockSize();
-  auto Result = Pdb.getBlockData(BlockList[First], Pdb.getBlockSize());
-  if (!Result)
-    return Result.takeError();
-  Buffer = Result->drop_front(OffsetInFirstBlock);
-  Buffer = ArrayRef<uint8_t>(Buffer.data(), ByteSpan);
-  return Error::success();
-}
-
-uint32_t MappedBlockStream::getLength() const { return Data->getLength(); }
-
-Error MappedBlockStream::commit() const { return Error::success(); }
-
-bool MappedBlockStream::tryReadContiguously(uint32_t Offset, uint32_t Size,
-                                            ArrayRef<uint8_t> &Buffer) const {
-  // Attempt to fulfill the request with a reference directly into the stream.
-  // This can work even if the request crosses a block boundary, provided that
-  // all subsequent blocks are contiguous.  For example, a 10k read with a 4k
-  // block size can be filled with a reference if, from the starting offset,
-  // 3 blocks in a row are contiguous.
-  uint32_t BlockNum = Offset / Pdb.getBlockSize();
-  uint32_t OffsetInBlock = Offset % Pdb.getBlockSize();
-  uint32_t BytesFromFirstBlock =
-      std::min(Size, Pdb.getBlockSize() - OffsetInBlock);
-  uint32_t NumAdditionalBlocks =
-      llvm::alignTo(Size - BytesFromFirstBlock, Pdb.getBlockSize()) /
-      Pdb.getBlockSize();
-
-  auto BlockList = Data->getStreamBlocks();
-  uint32_t RequiredContiguousBlocks = NumAdditionalBlocks + 1;
-  uint32_t E = BlockList[BlockNum];
-  for (uint32_t I = 0; I < RequiredContiguousBlocks; ++I, ++E) {
-    if (BlockList[I + BlockNum] != E)
-      return false;
-  }
-
-  uint32_t FirstBlockAddr = BlockList[BlockNum];
-  auto Result = Pdb.getBlockData(FirstBlockAddr, Pdb.getBlockSize());
-  if (!Result) {
-    consumeError(Result.takeError());
-    return false;
-  }
-  auto Data = Result->drop_front(OffsetInBlock);
-  Buffer = ArrayRef<uint8_t>(Data.data(), Size);
-  return true;
-}
-
-Error MappedBlockStream::readBytes(uint32_t Offset,
-                                   MutableArrayRef<uint8_t> Buffer) const {
-  uint32_t BlockNum = Offset / Pdb.getBlockSize();
-  uint32_t OffsetInBlock = Offset % Pdb.getBlockSize();
-
-  // Make sure we aren't trying to read beyond the end of the stream.
-  if (Buffer.size() > Data->getLength())
-    return make_error<RawError>(raw_error_code::insufficient_buffer);
-  if (Offset > Data->getLength() - Buffer.size())
-    return make_error<RawError>(raw_error_code::insufficient_buffer);
-
-  uint32_t BytesLeft = Buffer.size();
-  uint32_t BytesWritten = 0;
-  uint8_t *WriteBuffer = Buffer.data();
-  auto BlockList = Data->getStreamBlocks();
-  while (BytesLeft > 0) {
-    uint32_t StreamBlockAddr = BlockList[BlockNum];
-
-    auto Result = Pdb.getBlockData(StreamBlockAddr, Pdb.getBlockSize());
-    if (!Result)
-      return Result.takeError();
-
-    auto Data = *Result;
-    const uint8_t *ChunkStart = Data.data() + OffsetInBlock;
-    uint32_t BytesInChunk =
-        std::min(BytesLeft, Pdb.getBlockSize() - OffsetInBlock);
-    ::memcpy(WriteBuffer + BytesWritten, ChunkStart, BytesInChunk);
-
-    BytesWritten += BytesInChunk;
-    BytesLeft -= BytesInChunk;
-    ++BlockNum;
-    OffsetInBlock = 0;
-  }
-
-  return Error::success();
-}
-
-Error MappedBlockStream::writeBytes(uint32_t Offset,
-                                    ArrayRef<uint8_t> Buffer) const {
-  // Make sure we aren't trying to write beyond the end of the stream.
-  if (Buffer.size() > Data->getLength())
-    return make_error<RawError>(raw_error_code::insufficient_buffer);
-
-  if (Offset > Data->getLength() - Buffer.size())
-    return make_error<RawError>(raw_error_code::insufficient_buffer);
-
-  uint32_t BlockNum = Offset / Pdb.getBlockSize();
-  uint32_t OffsetInBlock = Offset % Pdb.getBlockSize();
-
-  uint32_t BytesLeft = Buffer.size();
-  auto BlockList = Data->getStreamBlocks();
-  uint32_t BytesWritten = 0;
-  while (BytesLeft > 0) {
-    uint32_t StreamBlockAddr = BlockList[BlockNum];
-    uint32_t BytesToWriteInChunk =
-        std::min(BytesLeft, Pdb.getBlockSize() - OffsetInBlock);
-
-    const uint8_t *Chunk = Buffer.data() + BytesWritten;
-    ArrayRef<uint8_t> ChunkData(Chunk, BytesToWriteInChunk);
-    if (auto EC = Pdb.setBlockData(StreamBlockAddr, OffsetInBlock, ChunkData))
-      return EC;
-
-    BytesLeft -= BytesToWriteInChunk;
-    BytesWritten += BytesToWriteInChunk;
-    ++BlockNum;
-    OffsetInBlock = 0;
-  }
-
-  // If this write overlapped a read which previously came from the pool,
-  // someone may still be holding a pointer to that alloc which is now invalid.
-  // Compute the overlapping range and update the cache entry, so any
-  // outstanding buffers are automatically updated.
-  for (const auto &MapEntry : CacheMap) {
-    // If the end of the written extent precedes the beginning of the cached
-    // extent, ignore this map entry.
-    if (Offset + BytesWritten < MapEntry.first)
-      continue;
-    for (const auto &Alloc : MapEntry.second) {
-      // If the end of the cached extent precedes the beginning of the written
-      // extent, ignore this alloc.
-      if (MapEntry.first + Alloc.size() < Offset)
-        continue;
-
-      // If we get here, they are guaranteed to overlap.
-      Interval WriteInterval = std::make_pair(Offset, Offset + BytesWritten);
-      Interval CachedInterval =
-          std::make_pair(MapEntry.first, MapEntry.first + Alloc.size());
-      // If they overlap, we need to write the new data into the overlapping
-      // range.
-      auto Intersection = intersect(WriteInterval, CachedInterval);
-      assert(Intersection.first <= Intersection.second);
-
-      uint32_t Length = Intersection.second - Intersection.first;
-      uint32_t SrcOffset =
-          AbsoluteDifference(WriteInterval.first, Intersection.first);
-      uint32_t DestOffset =
-          AbsoluteDifference(CachedInterval.first, Intersection.first);
-      ::memcpy(Alloc.data() + DestOffset, Buffer.data() + SrcOffset, Length);
-    }
-  }
-
-  return Error::success();
-}
-
-uint32_t MappedBlockStream::getNumBytesCopied() const {
-  return static_cast<uint32_t>(Pool.getBytesAllocated());
-}
-
-Expected<std::unique_ptr<MappedBlockStream>>
-MappedBlockStream::createIndexedStream(uint32_t StreamIdx,
-                                       const IPDBFile &File) {
-  if (StreamIdx >= File.getNumStreams())
-    return make_error<RawError>(raw_error_code::no_stream);
-
-  auto Data = llvm::make_unique<IndexedStreamData>(StreamIdx, File);
-  return llvm::make_unique<MappedBlockStreamImpl>(std::move(Data), File);
-}
-
-Expected<std::unique_ptr<MappedBlockStream>>
-MappedBlockStream::createDirectoryStream(const PDBFile &File) {
-  auto Data = llvm::make_unique<DirectoryStreamData>(File);
-  return llvm::make_unique<MappedBlockStreamImpl>(std::move(Data), File);
-}