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Disable some unsafe-fp-math DAG-combine transformation after legaliza…
…tion. For instance, following transformation will be disabled: x + x + x => 3.0f * x; The problem of these transformations is that it introduces a FP constant, which following Instruction-Selection pass cannot handle. Reviewed by Nadav, thanks a lot! rdar://13445387 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177933 91177308-0d34-0410-b5e6-96231b3b80d8
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