[PATCH] Enable HLE code generation

[darkbuck]

  this patch is rebased on trunk and is revised after the change replacing TargetFlags to HLEHint

Hi nadav, eli.friedman, jfifield, chandlerc, hfinkel,

http://llvm-reviews.chandlerc.com/D439

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D439?vs=1055&id=1144#toc

Files:
  lib/Target/X86/X86ISelDAGToDAG.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86InstrCompiler.td
  lib/Target/X86/X86InstrInfo.td
  test/CodeGen/X86/hle-atomic16.ll
  test/CodeGen/X86/hle-atomic32.ll
  test/CodeGen/X86/hle-atomic64.ll
  test/CodeGen/X86/hle-atomic8.ll
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