[llvm] [SelectOpt] Support ADD and SUB with zext operands. (PR #115489)

[Florian Hahn via llvm-commits]

fhahn wrote:

This only enables it for AArch64, @sapostolakis not sure if you would like to look into enabling this for other architectures (I think the OR support is only enabled for AArch64 as well)

https://github.com/llvm/llvm-project/pull/115489