Sanjay Patel c43a7874a3 [InstCombine] don't let 'exact' inhibit demanded bits folds for udiv ...

We shouldn't penalize instructions that have extra flags.

Drop the poison-generating flags if needed instead of bailing out.
This makes canonicalization/optimization more uniform.

There is a chance that dropping flags will cause some
other transform to not fire, but we added a preliminary
patch to avoid that with:
f0faea5714

See D140665 for more details.

2023-01-04 13:13:02 -05:00

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