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`Zcu.PerThead.ensureTypeUpToDate` is set up in such a way that it only returns the updated type the first time it is called. In general, that's okay; however, the exception is that we want the function to continue returning `error.AnalysisFail` when the type has been lost, or its number of captures changed. Therefore, the check for this case now happens before the up-to-date success return. For simplicity, the number of captures is now handled by intentionally losing the instruction in `Zcu.mapOldZirToNew`, since there is nothing to gain from tracking a type when old instances of it can never be reused.