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

[via llvm-commits]

Shoreshen wrote:

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

Hi @shiltian , thanks and sorry for the code format issue. I'll read through the code standard and make sure following the standard~

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