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Migrate some more fadd and fsub cases away from UnsafeFPMath control to utilize…

Authored by mcberg2017 on Jul 31 2019, 2:57 PM.

Description

Migrate some more fadd and fsub cases away from UnsafeFPMath control to utilize NoSignedZerosFPMath options control

Summary: Honoring no signed zeroes is also available as a user control through clang separately regardless of fastmath or UnsafeFPMath context, DAG guards should reflect this context.

Reviewers: spatel, arsenm, hfinkel, wristow, craig.topper

Reviewed By: spatel

Subscribers: rampitec, foad, nhaehnle, wuzish, nemanjai, jvesely, wdng, javed.absar, MaskRay, jsji

Differential Revision: https://reviews.llvm.org/D65170

llvm-svn: 367486