[llvm] [AMDGPU] Implement vop3p complex pattern optmization for gisel (PR #130234)

[Shilei Tian via llvm-commits]

https://github.com/shiltian commented:

Just drive by and find multiple code format issues. Can you check the LLVM code standard and refine your code accordingly?

https://github.com/llvm/llvm-project/pull/130234