[llvm] [AMDGPU] Remove SIWholeQuadMode pseudo wavemode optimization (PR #94133)

[Piotr Sobczak via llvm-commits]

piotrAMD wrote:

> > The existing if-endif cases kind of cover this, but I have added a new test which shows the issue with kill call in WQM shaders and strict WQM.
> 
> I don't see the new test?

Pre-committed in https://github.com/llvm/llvm-project/commit/a44d7406f45fd3e5af45de116aed03b0bf7a881f. 

https://github.com/llvm/llvm-project/pull/94133