Noah Goldstein e36caaeeb2 [SelectionDAG] Use computeKnownBits if Op is not recognized by isKnownNeverZero ...

The current logic is pretty limitted unless the `Op` is a
constant. This at least covers more obvious cases.

Reviewed By: craig.topper, foad

Differential Revision: https://reviews.llvm.org/D149196

2023-05-13 14:36:04 -05:00

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