[PATCH] Implement emitLeading/TrailingFence in the ARM backend

[Robin Morisset]

MakeDMB -> makeDMB
Erase comment.

http://reviews.llvm.org/D4960

Files:
  lib/CodeGen/AtomicExpandPass.cpp
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMISelLowering.h
  test/Transforms/AtomicExpand/ARM/atomic-expansion-v7.ll
  test/Transforms/AtomicExpand/ARM/cmpxchg-weak.ll
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