[PATCH] x86 NaCl: Emit LAHF/SAHF instead of PUSHF/POPF

[JF Bastien]

Check liveness of AX before push/pop.
SETcc takes 8-bit register AL.


http://reviews.llvm.org/D6629

Files:
  lib/Target/X86/X86InstrInfo.cpp
  test/CodeGen/X86/cmpxchg-clobber-flags.ll

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