[llvm] [RFC][AMDGPU] Remove old llvm.amdgcn.buffer.* and tbuffer intrinsics (PR #93801)

[Marek Olšák via llvm-commits]

marekolsak wrote:

> @marekolsak does Mesa use any of the old buffer intrinsics?

No, Mesa doesn't use them.

https://github.com/llvm/llvm-project/pull/93801