[llvm] [AMDGPU] Avoid put implicit_def into bundle that break reg's liveness (PR #142563)

[via llvm-commits]

Shoreshen wrote:

> This is probably essentially correct, although I think this entire finalizeBundle should probably be rewritten to operate in terms of regunits, and then figure out how to turn that into physical register references at the end

Hi @arsenm , I think you are right, I'll separate `LocalDefs` for physical and virtual (since I don't know if they will overlap) and use regunit for physical

https://github.com/llvm/llvm-project/pull/142563