[llvm] [AMDGPU] InstCombine: fold invalid calls to amdgcn intrinsics into poison values (PR #191904)

[Yoonseo Choi via llvm-commits]

yoonseoch wrote:

@arsenm I don't have privilege to add reviewers. This PR was upon your comments linked in the description section. 

https://github.com/llvm/llvm-project/pull/191904