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

[Chinmay Deshpande via llvm-commits]

chinmaydd wrote:

Closing this due to lack of activity. MCAD continues to ship with a .patch file that recommends users apply this change on build.

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