[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

[InstCombine] Demand bits of UMax

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- Committed
dmgreen Thu, 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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