[PATCH] CodeGen: improve ms instrincics support

[Saleem Abdulrasool]

Hi rnk, whunt,

Add support for _InterlockedCompareExchangePointer, _InterlockExchangePointer,
_InterlockExchange.  These are available as a compiler intrinsic on ARM and x86.

http://reviews.llvm.org/D4182

Files:
  include/clang/Basic/Builtins.def
  lib/CodeGen/CGBuiltin.cpp
  lib/Sema/SemaChecking.cpp
  test/CodeGen/ms-intrinsics.c
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