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

[JF Bastien]

CALL is now preceded by MOV since @bar takes arguments.

Re-running the NaCl tests, only i386 works. The -pre-RA-sched=fast version fails, and so do both x86-64 versions, because the calling convention and register allocator collude to change AX's liveness from one version to another. I could have 2 CHECK tests for i386, and 1 for x86-64.


http://reviews.llvm.org/D6629

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

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