[llvm] [MachineCopyPropagation] Recognise and delete no-op moves produced after forwarded uses (PR #129889)

[David Green via llvm-commits]

davemgreen wrote:

Thanks in either case for the report. Do you mind giving #137348 a run with your original problem case to see if it fixes all the issues you are seeing or if some remain?

https://github.com/llvm/llvm-project/pull/129889