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, 225 deletions

diff --git a/contrib/llvm/lib/Target/TargetRecip.cpp b/contrib/llvm/lib/Target/TargetRecip.cpp
deleted file mode 100644
index 183fa50..0000000
--- a/contrib/llvm/lib/Target/TargetRecip.cpp
+++ /dev/null
@@ -1,225 +0,0 @@
-//===-------------------------- TargetRecip.cpp ---------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This class is used to customize machine-specific reciprocal estimate code
-// generation in a target-independent way.
-// If a target does not support operations in this specification, then code
-// generation will default to using supported operations.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Target/TargetRecip.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/Support/ErrorHandling.h"
-
-using namespace llvm;
-
-// These are the names of the individual reciprocal operations. These are
-// the key strings for queries and command-line inputs.
-// In addition, the command-line interface recognizes the global parameters
-// "all", "none", and "default".
-static const char *const RecipOps[] = {
-  "divd",
-  "divf",
-  "vec-divd",
-  "vec-divf",
-  "sqrtd",
-  "sqrtf",
-  "vec-sqrtd",
-  "vec-sqrtf",
-};
-
-// The uninitialized state is needed for the enabled settings and refinement
-// steps because custom settings may arrive via the command-line before target
-// defaults are set.
-TargetRecip::TargetRecip() {
-  unsigned NumStrings = llvm::array_lengthof(RecipOps);
-  for (unsigned i = 0; i < NumStrings; ++i)
-    RecipMap.insert(std::make_pair(RecipOps[i], RecipParams()));
-}
-
-static bool parseRefinementStep(StringRef In, size_t &Position,
-                                uint8_t &Value) {
-  const char RefStepToken = ':';
-  Position = In.find(RefStepToken);
-  if (Position == StringRef::npos)
-    return false;
-
-  StringRef RefStepString = In.substr(Position + 1);
-  // Allow exactly one numeric character for the additional refinement
-  // step parameter.
-  if (RefStepString.size() == 1) {
-    char RefStepChar = RefStepString[0];
-    if (RefStepChar >= '0' && RefStepChar <= '9') {
-      Value = RefStepChar - '0';
-      return true;
-    }
-  }
-  report_fatal_error("Invalid refinement step for -recip.");
-}
-
-bool TargetRecip::parseGlobalParams(const std::string &Arg) {
-  StringRef ArgSub = Arg;
-
-  // Look for an optional setting of the number of refinement steps needed
-  // for this type of reciprocal operation.
-  size_t RefPos;
-  uint8_t RefSteps;
-  StringRef RefStepString;
-  if (parseRefinementStep(ArgSub, RefPos, RefSteps)) {
-    // Split the string for further processing.
-    RefStepString = ArgSub.substr(RefPos + 1);
-    ArgSub = ArgSub.substr(0, RefPos);
-  }
-  bool Enable;
-  bool UseDefaults;
-  if (ArgSub == "all") {
-    UseDefaults = false;
-    Enable = true;
-  } else if (ArgSub == "none") {
-    UseDefaults = false;
-    Enable = false;
-  } else if (ArgSub == "default") {
-    UseDefaults = true;
-  } else {
-    // Any other string is invalid or an individual setting.
-    return false;
-  }
-
-  // All enable values will be initialized to target defaults if 'default' was
-  // specified.
-  if (!UseDefaults)
-    for (auto &KV : RecipMap)
-      KV.second.Enabled = Enable;
-
-  // Custom refinement count was specified with all, none, or default.
-  if (!RefStepString.empty())
-    for (auto &KV : RecipMap)
-      KV.second.RefinementSteps = RefSteps;
-  
-  return true;
-}
-
-void TargetRecip::parseIndividualParams(const std::vector<std::string> &Args) {
-  static const char DisabledPrefix = '!';
-  unsigned NumArgs = Args.size();
-
-  for (unsigned i = 0; i != NumArgs; ++i) {
-    StringRef Val = Args[i];
-    
-    bool IsDisabled = Val[0] == DisabledPrefix;
-    // Ignore the disablement token for string matching.
-    if (IsDisabled)
-      Val = Val.substr(1);
-    
-    size_t RefPos;
-    uint8_t RefSteps;
-    StringRef RefStepString;
-    if (parseRefinementStep(Val, RefPos, RefSteps)) {
-      // Split the string for further processing.
-      RefStepString = Val.substr(RefPos + 1);
-      Val = Val.substr(0, RefPos);
-    }
-
-    RecipIter Iter = RecipMap.find(Val);
-    if (Iter == RecipMap.end()) {
-      // Try again specifying float suffix.
-      Iter = RecipMap.find(Val.str() + 'f');
-      if (Iter == RecipMap.end()) {
-        Iter = RecipMap.find(Val.str() + 'd');
-        assert(Iter == RecipMap.end() && "Float entry missing from map");
-        report_fatal_error("Invalid option for -recip.");
-      }
-      
-      // The option was specified without a float or double suffix.
-      if (RecipMap[Val.str() + 'd'].Enabled != Uninitialized) {
-        // Make sure that the double entry was not already specified.
-        // The float entry will be checked below.
-        report_fatal_error("Duplicate option for -recip.");
-      }
-    }
-    
-    if (Iter->second.Enabled != Uninitialized)
-      report_fatal_error("Duplicate option for -recip.");
-    
-    // Mark the matched option as found. Do not allow duplicate specifiers.
-    Iter->second.Enabled = !IsDisabled;
-    if (!RefStepString.empty())
-      Iter->second.RefinementSteps = RefSteps;
-    
-    // If the precision was not specified, the double entry is also initialized.
-    if (Val.back() != 'f' && Val.back() != 'd') {
-      RecipParams &Params = RecipMap[Val.str() + 'd'];
-      Params.Enabled = !IsDisabled;
-      if (!RefStepString.empty())
-        Params.RefinementSteps = RefSteps;
-    }
-  }
-}
-
-TargetRecip::TargetRecip(const std::vector<std::string> &Args) :
-  TargetRecip() {
-  unsigned NumArgs = Args.size();
-
-  // Check if "all", "default", or "none" was specified.
-  if (NumArgs == 1 && parseGlobalParams(Args[0]))
-    return;
- 
-  parseIndividualParams(Args);
-}
-
-bool TargetRecip::isEnabled(StringRef Key) const {
-  ConstRecipIter Iter = RecipMap.find(Key);
-  assert(Iter != RecipMap.end() && "Unknown name for reciprocal map");
-  assert(Iter->second.Enabled != Uninitialized &&
-         "Enablement setting was not initialized");
-  return Iter->second.Enabled;
-}
-
-unsigned TargetRecip::getRefinementSteps(StringRef Key) const {
-  ConstRecipIter Iter = RecipMap.find(Key);
-  assert(Iter != RecipMap.end() && "Unknown name for reciprocal map");
-  assert(Iter->second.RefinementSteps != Uninitialized &&
-         "Refinement step setting was not initialized");
-  return Iter->second.RefinementSteps;
-}
-
-/// Custom settings (previously initialized values) override target defaults.
-void TargetRecip::setDefaults(StringRef Key, bool Enable,
-                              unsigned RefSteps) {
-  if (Key == "all") {
-    for (auto &KV : RecipMap) {
-      RecipParams &RP = KV.second;
-      if (RP.Enabled == Uninitialized)
-        RP.Enabled = Enable;
-      if (RP.RefinementSteps == Uninitialized)
-        RP.RefinementSteps = RefSteps;
-    }
-  } else {
-    RecipParams &RP = RecipMap[Key];
-    if (RP.Enabled == Uninitialized)
-      RP.Enabled = Enable;
-    if (RP.RefinementSteps == Uninitialized)
-      RP.RefinementSteps = RefSteps;
-  }
-}
-
-bool TargetRecip::operator==(const TargetRecip &Other) const {
-  for (const auto &KV : RecipMap) {
-    StringRef Op = KV.first;
-    const RecipParams &RP = KV.second;
-    const RecipParams &OtherRP = Other.RecipMap.find(Op)->second;
-    if (RP.RefinementSteps != OtherRP.RefinementSteps)
-      return false;
-    if (RP.Enabled != OtherRP.Enabled)
-      return false;
-  }
-  return true;
-}