[llvm] [AMDGPU] Reset WavesPerEU in AAAMDWavesPerEU::initialize (PR #114162)

[Shilei Tian via llvm-commits]

https://github.com/shiltian requested changes to this pull request.

I'm gonna put a block here because it doesn't look like a correct fix. We can discuss more offline.

https://github.com/llvm/llvm-project/pull/114162