[PATCH] [X86] Allow atomic operations using immediates to avoid using a register

[Robin Morisset]

Trying to fix my previous mistake with arcanist and make the diff reappear in Phabricator

http://reviews.llvm.org/D4796

Files:
  lib/Target/X86/X86CodeEmitter.cpp
  lib/Target/X86/X86InstrCompiler.td
  lib/Target/X86/X86MCInstLower.cpp
  test/CodeGen/X86/atomic_mi.ll
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