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

[Matt Arsenault via llvm-commits]

https://github.com/arsenm commented:

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 

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