[InstCombine] Demand bits of UMax

Description

[InstCombine] Demand bits of UMax

Use the demanded bits of umax(A,C) to prove we can just use A so long as the
lowest non-zero bit of DemandMask is higher than the highest non-zero bit of C

Differential Revision: https://reviews.llvm.org/D53033

Details

Committed
dmgreenThu, Oct 11, 4:04 AM
Differential Revision
D53033: [InstCombine] Demand bits of UMAX
Parents
rL344236: [InstCombine] Add tests for demand bits of min/max. NFC.
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