Philip Reames 312a532dc0 [GVN/FP] Considate logic for reasoning about equality vs equivalance for floats ...

Factor out common logic into some reasonable commented helper functions. In the process, ensure that the in-block vs cross-block cases are handled the same. They previously weren't.

Differential Revision: https://reviews.llvm.org/D67126

2020-01-07 16:05:04 -08:00

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