[llvm] [ScheduleDAG] Dirty height/depth in addPred/removePred even for latency zero (PR #102915)

[Matthias Braun via llvm-commits]

https://github.com/MatzeB approved this pull request.

The change makes sense to me. Luckily it seems the churn created by this seems to be low (judging from the few unit tests changed).
Maybe keep an eye out for https://llvm-compile-time-tracker.com/ 

LGTM

https://github.com/llvm/llvm-project/pull/102915