[llvm] [InstCombine] Pattern match minmax calls for unsigned saturation. (PR #99250)

[via llvm-commits]

goldsteinn wrote:

The `smin(UINT_MAX, (sub (zext A), (zext B))` is dead code: https://alive2.llvm.org/ce/z/AZ-puW

https://github.com/llvm/llvm-project/pull/99250