[PATCH] Add HLE hint support for atomic builtins

[darkbuck]

  Hi All

  This patch is rebased against clang trunk due to the code reorganization in clang trunk.

  Thanks
  - Michael

Hi eli.friedman, hfinkel, jfifield, chandlerc,

http://llvm-reviews.chandlerc.com/D440

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D440?vs=1145&id=1324#toc

Files:
  lib/CodeGen/CGAtomic.cpp
  lib/CodeGen/CGBuiltin.cpp
  test/CodeGen/atomic-ops-targetflags.c
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