Sema: Only diagnose retroactive conformances once #71596
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A type may conform to a single protocol via multiple inheritance clauses on the same extension. When this occurs, we must be careful to only diagnose that conformance as needing `@retroactive` once, or not at all if one of those clauses is marked `@retroactive`. Resolves rdar://121479047
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A type may conform to a single protocol via multiple inheritance clauses on the same extension. When this occurs, we must be careful to only diagnose that conformance as needing
@retroactiveonce, or not at all if one of those clauses is marked@retroactive.Resolves rdar://121479047