[llvm] [X86][GlobalIsel] Support G_[U|S]MIN/G_[U|S]MAX test (PR #157621)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon commented:

its often easier to maintain if you have 4 separate files for the 4 opcodes - if nothing else you can copy and then search/replace the u/s min/max intrinsic :) 

https://github.com/llvm/llvm-project/pull/157621