[PATCH] [Power] Use AtomicExpandPass for fence insertion, and use lwsync where appropriate

[Robin Morisset]

Fix formatting based on hfinkel comments.

About replacing the BookE flag by a special flag for the sync instruction,
should I try doing it in this patch, or is it best as a separate thing ?

http://reviews.llvm.org/D5180

Files:
  include/llvm/IR/IntrinsicsPowerPC.td
  lib/Target/PowerPC/PPCISelLowering.cpp
  lib/Target/PowerPC/PPCISelLowering.h
  lib/Target/PowerPC/PPCInstrInfo.td
  lib/Target/PowerPC/PPCTargetMachine.cpp
  test/CodeGen/PowerPC/atomics.ll
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