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

[Robin Morisset]

Add a Fixme about the use of IsBookE flag for sync support.

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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