[MachineOutliner] Efficient Implementation of MachineOutliner::findCandidates() (#90260) This reduce the time complexity of the main loop of `findCandidates()` method from $O(n^2)$ to $O(n \log n)$. For small $n$, the modification does not regress the build time, but it helps significantly when $n$ is large. For one application, this reduces the runtime of the main loop from 120 seconds to 28 seconds. This is the first commit for an enhanced version of machine outliner -- see [RFC](https://discourse.llvm.org/t/rfc-enhanced-machine-outliner-part-1-fulllto-part-2-thinlto-nolto-to-come/78732).
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