Sanjay Patel f51a1549df Revert [IR] allow fast-math-flags on phi of FP values
This reverts r372866 (git commit dec03223a97af0e4dfcb23da55c0f7f8c9b62d00)

llvm-svn: 372868
2019-09-25 13:29:09 +00:00
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