[llvm] [InstCombine] Avoid folding `select(umin(X, Y), X)` with min/max values in false arm (PR #143020)

[Nikita Popov via llvm-commits]

nikic wrote:

I've landed a phase ordering test in https://github.com/llvm/llvm-project/commit/cef5a3155bab9a2db5389f782471d56f1dd15b61. Please rebase & regenerate when updating this PR.

https://github.com/llvm/llvm-project/pull/143020