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

[JF Bastien]

Update test to properly eliminate dead AX push/pop. My previous comment was wrong: AX was indeed defined but subsequently unused. The test now exercise live AX before and after the call, and everything looks good.


http://reviews.llvm.org/D6629

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

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