[llvm] [AMDGPU] Remove the AnnotateKernelFeatures pass (PR #130198)

[Jun Wang via llvm-commits]

jwanggit86 wrote:

> > Most of the test changes should just regenerate to use the new output, and not add the attribute. The attribute should only be added in cases where it's directly relevant to the test (like the kernel metadata tests)
> 
> I'm not sure. Adding the attribute to existing test cases can avoid unnecessary check line changes, which makes the line history more consistent.

I'm fine either way, but now most of the manually added attributes have been removed.

https://github.com/llvm/llvm-project/pull/130198