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

[Robin Morisset]

Closed by commit rL218995 (authored by @morisset).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D5317

Files:
  llvm/trunk/lib/Target/PowerPC/PPCInstrInfo.td
  llvm/trunk/test/CodeGen/PowerPC/atomics-fences.ll
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