[llvm] [DAG] fold avgu(zext(x), zext(y)) -> zext(avgu(x, y)) (PR #95134)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

For tests you can start with these: https://simd.godbolt.org/z/xfrWo8Tc7

https://github.com/llvm/llvm-project/pull/95134