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

[Robin Morisset]

Send the right patch this time.

http://reviews.llvm.org/D4961

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