[PATCH] Refactor AtomicExpandPass and add a generic isAtomic() method to Instruction

[Robin Morisset]

Fix things pointed out by jfb.

See comments inline sent previously for details.

http://reviews.llvm.org/D5035

Files:
  include/llvm/IR/Instruction.h
  include/llvm/IR/Instructions.h
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/AtomicExpandPass.cpp
  lib/IR/Instruction.cpp
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMISelLowering.h
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