[PATCH] Lower idempotent RMWs to fence+load

[Robin Morisset]

Add requested comments

http://reviews.llvm.org/D5422

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/AtomicExpandPass.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.h
  test/CodeGen/X86/atomic_idempotent.ll
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