[llvm] [DAGCombiner] Share byte provider steps with AMDGPU target (PR #221959)

[Arseniy Obolenskiy via llvm-commits]

aobolensk wrote:

> The change looks fine, but I'm less sure about the include of `SelectionDAGNodes.h` in such a trivial header.

Dropped completely unused ByteProvider template parameter and the header is gone now too 

https://github.com/llvm/llvm-project/pull/221959