Craig Topper 8b23b2bbd9 [CodeGen] Use CreateFNeg in buildFMulAdd ...

We have an fneg instruction now and should use it instead of the fsub -0.0 idiom. Looks like we had no test that showed that we handled the negation cases here so I've added new tests.

Differential Revision: https://reviews.llvm.org/D72010

2019-12-30 13:24:11 -08:00

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