Nikita Popov 52a1998f15 [ValueTracking] Don't accept undef in isKnownNonZero() ...

As the undef can be replaced with a zero value, this is not legal
in the general case. We can only allow poison values. This matches
what the other ValueTracking helpers like computeKnownBits() do.

2024-04-15 13:54:09 +09:00

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