[llvm] [MachineOutliner] Efficient Implementation of MachineOutliner::findCandidates() (PR #90260)

[Kyungwoo Lee via llvm-commits]

https://github.com/kyulee-com approved this pull request.

ltgm. however, I'd like to hear other opinions.
@ornata Do you have a concerns or comments on this direction?

https://github.com/llvm/llvm-project/pull/90260