[ValueTracking] return zero when there's conflict in known bits of a shift…

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[ValueTracking] return zero when there's conflict in known bits of a shift (PR34838)

Poison allows us to return a better result than undef.

Details

Committed
spatelThu, Oct 12, 10:31 AM
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rL315594: [X86] Use -ffreestanding instead of using the mm_malloc.h include guard hack on…
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