[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:

> @nikic The test you added now fails, what's the next step?

Regenerate it using update_test_checks.py and commit the result.

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