[llvm] [MCP] Enhance MCP copy Instruction removal for special case (PR #70778)

[via llvm-commits]

LWenH wrote:

Address comments, I think a more general solution would be to remove the MI pair record from the tracker when encountering a COPY instruction. This addresses the root cause of the problem, which is an outdated src record in the tracker causing the incorrect invalidation of other instructions.

https://github.com/llvm/llvm-project/pull/70778