[PATCH] [Core] Update references in parallel

[Rui Ueyama]

REPOSITORY
  rL LLVM

================
Comment at: lib/Core/Resolver.cpp:355
@@ -353,3 +354,3 @@
           if (_symbolTable.isCoalescedAway(atom))
             _deadAtoms.insert(ref->target());
           continue;
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I think this change is not thread-safe because of this line. _deadAtoms.insert is not thread-safe.

http://reviews.llvm.org/D8372

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