[MachineCopyPropagation][NFC] Refactor EliminateSpillageCopies (#192609) This patch builds on the original implementation to address areas that may impact compile time regression if enabled. The aim of the patch is to streamline and improve the implementation for better compile time impact. A summary of the changes is as follows: - Cost modelling that does an initial scan of the block, any blocks with less than 6 copies are immediately skipped. - RegMask scan in `findLastSeenDefInCopy` removed. This now only checks the recorded copies to ensure that RegMasks are clobbered when they are seen if they clobber a Reg - Streamlining of `IsSpillReloadPair` and `IsChainedCopy` to reduce the need for a second call to isCopyInstr to get the DestSourcePair, these are now returned from the lamdba function - Use of TRI API to get the CommonRegClass Assisted-by: Claude Sonnet 4.6 (Co-Pilot)
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