[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:

@thevar1able Doesn't exactly the code you had work? I tried it and the test was vectorized: https://gist.github.com/nikic/4cf44aac838daa41be953c8a7d06920c

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