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6cdc83b64e
Various cleanups to dest prop This makes fixing the issues identified in #105577 easier. A couple changes - Use an enum with names instead of a bool - Only call `remove_candidates_if` from one place instead of two. Doing it from two places is far too fragile, since any divergence in the behavior between those callsites is likely to be unsound. - Remove `is_constant`. Right now we only merge locals, so this doesn't do anything, and the logic would be wrong if it did. r? `@tmiasko`