[llvm] [InstCombine] Fold npos select around umin (PR #202748)

[Nikita Popov via llvm-commits]

https://github.com/nikic requested changes to this pull request.

This should be handled via the derefinement path in simplifyWithOpsReplaced. This is a min/max identity, similar to the existing binop identity case.

https://github.com/llvm/llvm-project/pull/202748