[llvm] [AMDGPU] Replace dynamic VGPR feature with attribute (PR #133444)

[via llvm-commits]

bmb0537 wrote:

> > I have a question, how do programmers use this feature？
> 
> This is currently only used by the compiler, it is not intended to be used by programmers in its current form.

May I ask, in what way will it ultimately be provided to programmers for use？

https://github.com/llvm/llvm-project/pull/133444