Kevin P. Neal f86c930cc9 [FPEnv][InstSimplify] Fold constrained X + -0.0 ==> X ...

Currently the fadd optimizations in InstSimplify don't know how to do this
"X + -0.0 ==> X" fold when using the constrained intrinsics. This adds the
support.

This commit is derived from D106362 with some improvements from D107285.

Differential Revision: https://reviews.llvm.org/D111085

2021-10-06 13:52:31 -04:00

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