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

[Robin Morisset]

  - Add 'CHECK-NOT: lock' (and comment) to atomic_mi.ll, based on Philip Reames suggestion
  - Add three missing tests to atomic_mi.ll

http://reviews.llvm.org/D4796

Files:
  test/CodeGen/X86/atomic_mi.ll
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