[PATCH] [Power] Use lwsync for non-seq_cst fences

[Robin Morisset]

Hi jfb, wschmidt,

hwsync is only required for seq_cst fences, acquire and release one can use
the cheaper lwsync.

http://reviews.llvm.org/D5317

Files:
  lib/Target/PowerPC/PPCInstrInfo.td
  test/CodeGen/PowerPC/atomics.ll
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