[MachineOutliner][NFC] Remove unnecessary RepeatedSequenceLocs.clear() (#106171)
- When `getOutliningCandidateInfo()` returns `std::nullopt` (meaning no
`OutlinedFunction` is created), there is no need to clear the input
argument, `RepeatedSequenceLocs`, as it's already being cleared in the
main loop of `findCandidates()`.
- Replaced `2` by `MinRepeats`, which I missed from
https://github.com/llvm/llvm-project/pull/105398