[PATCH] Add HLE hint in AtomicSDNode and MemInrinsicSDNode

[darkbuck]

  previous TargetFlags is revised to HLEHint

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

http://llvm-reviews.chandlerc.com/D436

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D436?vs=1052&id=1141#toc

Files:
  include/llvm/CodeGen/SelectionDAG.h
  include/llvm/CodeGen/SelectionDAGNodes.h
  include/llvm/IR/Instructions.h
  lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
  lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.cpp
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