Upgrade our copy of clang and llvm to 3.5.1 release. This is a bugfix

only release, no new features have been added.

Please note that this version requires C++11 support to build; see
UPDATING for more information.

Release notes for llvm and clang can be found here:
<http://llvm.org/releases/3.5.1/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.5.1/tools/clang/docs/ReleaseNotes.html>

MFC after:	1 month
X-MFC-With:	276479

1 files changed, 17 insertions, 5 deletions

diff --git a/contrib/llvm/lib/Analysis/BlockFrequencyInfoImpl.cpp b/contrib/llvm/lib/Analysis/BlockFrequencyInfoImpl.cpp
index 3203c37..723332d 100644
--- a/contrib/llvm/lib/Analysis/BlockFrequencyInfoImpl.cpp
+++ b/contrib/llvm/lib/Analysis/BlockFrequencyInfoImpl.cpp
@@ -14,7 +14,7 @@
 #include "llvm/Analysis/BlockFrequencyInfoImpl.h"
 #include "llvm/ADT/SCCIterator.h"
 #include "llvm/Support/raw_ostream.h"
-#include <deque>
+#include <numeric>
 
 using namespace llvm;
 using namespace llvm::bfi_detail;
@@ -123,8 +123,12 @@ static void combineWeight(Weight &W, const Weight &OtherW) {
   }
   assert(W.Type == OtherW.Type);
   assert(W.TargetNode == OtherW.TargetNode);
-  assert(W.Amount < W.Amount + OtherW.Amount && "Unexpected overflow");
-  W.Amount += OtherW.Amount;
+  assert(OtherW.Amount && "Expected non-zero weight");
+  if (W.Amount > W.Amount + OtherW.Amount)
+    // Saturate on overflow.
+    W.Amount = UINT64_MAX;
+  else
+    W.Amount += OtherW.Amount;
 }
 static void combineWeightsBySorting(WeightList &Weights) {
   // Sort so edges to the same node are adjacent.
@@ -207,11 +211,19 @@ void Distribution::normalize() {
     Shift = 33 - countLeadingZeros(Total);
 
   // Early exit if nothing needs to be scaled.
-  if (!Shift)
+  if (!Shift) {
+    // If we didn't overflow then combineWeights() shouldn't have changed the
+    // sum of the weights, but let's double-check.
+    assert(Total == std::accumulate(Weights.begin(), Weights.end(), UINT64_C(0),
+                                    [](uint64_t Sum, const Weight &W) {
+                      return Sum + W.Amount;
+                    }) &&
+           "Expected total to be correct");
     return;
+  }
 
   // Recompute the total through accumulation (rather than shifting it) so that
-  // it's accurate after shifting.
+  // it's accurate after shifting and any changes combineWeights() made above.
   Total = 0;
 
   // Sum the weights to each node and shift right if necessary.