[PATCH] Use target-dependent emitLeading/TrailingFence instead of the target-independent insertLeading/TrailingFence (in AtomicExpandPass)

[Robin Morisset]

Fix the problems pointed by the inline comments of jfb.

http://reviews.llvm.org/D4961

Files:
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMISelLowering.h
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