[llvm] [llvm-mca] Add optional identifier field to mca::Instruction (PR #97867)

[Chinmay Deshpande via llvm-commits]

chinmaydd wrote:

Thats fair.

1. Apart from this one change, MCAD is now completely compatible with upstream. We are no longer maintaining a custom fork. We are currently shipping MCAD with a patch file that applies this change.
2. I'm okay with marking it as experimental for a while. If the community decides to remove it, I would appreciate a ping / mention so that we can update our build instructions.

Thanks !

https://github.com/llvm/llvm-project/pull/97867