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

[Matt Arsenault via llvm-commits]

arsenm wrote:

> I.e., how am I supposed to review, let alone update the tests with the change from 2621450 to 2424842? I know how to do it, but how am I supposed to? How am I supposed to review your change for example?

It doesn't matter, it's just renumbering. The actual change is the string comment on the inline asm. Someone should do this infrastructure, but that's not happening today 

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