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Teach InstSimplify -X + X --> 0.0 about unary FNeg

Authored by cameron.mcinally on May 15 2019, 7:31 AM.

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Teach InstSimplify -X + X --> 0.0 about unary FNeg

Differential Revision: https://reviews.llvm.org/D61916

llvm-svn: 360777

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