[llvm] [AMDGPU] Fold high-half 16-bit extracts into VOP3 op_sel (PR #222255)

[Madhur Kumar via llvm-commits]

MadhurKumar004 wrote:

@jayfoad Can you take a look at this or maybe assign other reviewers? Thank You

https://github.com/llvm/llvm-project/pull/222255