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[InstCombine] Update fptrunc (fneg x)) -> (fneg (fptrunc x) for unary FNeg

Authored by cameron.mcinally on Jun 11 2019, 8:45 AM.

Description

[InstCombine] Update fptrunc (fneg x)) -> (fneg (fptrunc x) for unary FNeg

Differential Revision: https://reviews.llvm.org/D62629

llvm-svn: 363080