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

[Shilei Tian via llvm-commits]

shiltian 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.

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