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

[Robin Morisset]

Hi jfb, nadav,

I had forgotten to check for NotSlowIncDec in the patterns that can generate
inc/dec for the above pattern (added in D4796).

http://reviews.llvm.org/D5677

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