[PATCH] X86: If we have an instruction that sets a flag and a zero test on the input of that instruction try to eliminate the test.

[Benjamin Kramer]

Closed by commit rL208788 (authored by d0k).

http://reviews.llvm.org/D3454

Files:
  llvm/trunk/lib/Target/X86/X86InstrInfo.cpp
  llvm/trunk/test/CodeGen/X86/peep-test-4.ll
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