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[MCP] Remove dead copies from basic blocks with successors. (#86973)
Previously we wouldn't remove dead copies from basic blocks with successors. The comment said we didn't want to trust the live-in lists. The comment is very old so I'm not sure if that's still a concern today. This patch checks the live-in lists and removes copies from MaybeDeadCopies if they are referenced by any live-ins in any successors. We only do this if the tracksLiveness property is set. If that property is not set, we retain the old behavior.
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