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The ARM backend can eliminate cmp instructions by reusing flags from a nearby sub instruction with similar arguments. Don't do that if the sub is predicated - the flags are not written unconditionally. <rdar://problem/12263428> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163535 91177308-0d34-0410-b5e6-96231b3b80d8
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