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

[Matt Arsenault via llvm-commits]

arsenm 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? 

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