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

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 commented:

Do you have more information on how you intend to use this? I'm struggling to see how this would be particularly useful, especially with instruction recycling where you would end up picking up the identifier of a previous instruction that has been recycled.

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