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Revert "[InstCombine] add tests for umin/umax via usub.sat; NFC"

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Revert "[InstCombine] add tests for umin/umax via usub.sat; NFC"

This reverts commit rL365999 / 0f6148df23edcd3081f5e761de19edd4f823f16d.
The tests already exist in this file, and the hoped-for transform
(mentioned in D62871) is invalid because of undef as discussed in
D63060.