[PATCH] [X86] Avoid generating inc/dec when slow for x.atomic_store(1 + x.atomic_load())

[Robin Morisset]

Closed by commit rL219336 (authored by @morisset).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D5677

Files:
  llvm/trunk/lib/Target/X86/X86InstrCompiler.td
  llvm/trunk/test/CodeGen/X86/atomic_mi.ll
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