[llvm] [llvm-mca][FeatureRequest] Itimeline graph, note source of delay for each instruction (PR #136423)

[Andrea Di Biagio via llvm-commits]

adibiagio wrote:

May I suggest low-case 'd' instead of P for the "waiting for data dependency" case?
Not sure what other people think though...

https://github.com/llvm/llvm-project/pull/136423