[PATCH] Add HLE hint support for atomic builtins

[darkbuck]

  the patch is revised to replace targetflags with HLE hint.

Hi eli.friedman, hfinkel, jfifield, chandlerc,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D440?vs=1056&id=1145#toc

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