[MachineOutliner][NFC] Refactor (#105398) This patch prepares the NFC groundwork for global outlining using CGData, which will follow https://github.com/llvm/llvm-project/pull/90074. - The `MinRepeats` parameter is now explicitly passed to the `getOutliningCandidateInfo` function, rather than relying on a default value of 2. For local outlining, the minimum number of repetitions is typically 2, but for the global outlining (mentioned above), we will optimistically create a single `Candidate` for each `OutlinedFunction` if stable hashes match a specific code sequence. This parameter is adjusted accordingly in global outlining scenarios. - I have also implemented `unique_ptr` for `OutlinedFunction` to ensure safe and efficient memory management within `FunctionList`, avoiding unnecessary implicit copies. This depends on https://github.com/llvm/llvm-project/pull/101461. This is a patch for https://discourse.llvm.org/t/rfc-enhanced-machine-outliner-part-2-thinlto-nolto/78753.
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