[llvm] AMDGPU: Remove m0 classes (PR #161758)

[Stanislav Mekhanoshin via llvm-commits]

rampitec wrote:

> > I think before it can go all mir tests checking exact RC numbers shall go away.
> 
> Absolutely not. We need new mir syntax handling for this. We cannot simply remove these, nor block progress on that work.

I am tired updating these obscure numbers.

https://github.com/llvm/llvm-project/pull/161758