Slava Pestov e5af49a282 AST: Tweak ConformanceLookupTable::compareConformances() some more ...

If two conformances imply a conformance to the same marker
protocol, don't diagnose redundancy if they differ by
unavailability. Instead, allow the more available conformance
to win.

This allows declaring a type that conforms to a protocol
that inherits from SendableMetatype, followed by an
unavailable Sendable conformance on the same type.

Fixes rdar://152509409.

2025-06-23 22:57:05 -04:00

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