Manman Ren 62a89f5808 X86: remove redundant cmp against zero.
Updated OptimizeCompare in peephole to remove redundant cmp against zero.
We only remove Compare if CF and OF are not used.

rdar://11855129


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160454 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-18 21:40:01 +00:00
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