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

[Jay Foad via llvm-commits]

jayfoad 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?

You can use `utils/update_mir_regclass_numbers` to update tests.

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