Sema: Skip diagnosing witness availability for unavailable conformances #79537
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If a conformance is unavailable then checking for the potential unavailability of a witness doesn't make sense so skip it. This is necessary now because availability scopes no longer constrain the platform introduction version for a source range in that is annotated in source to be simultaneously unavailable and also introduced in a later version. This fixes a regression caused by swiftlang#79249. Resolves rdar://145255592.
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If a conformance is unavailable then checking for the potential unavailability of a witness doesn't make sense so skip it. This is necessary now because availability scopes no longer constrain the platform introduction version for a source range in that is annotated in source to be simultaneously unavailable and also introduced in a later version.
This fixes a regression caused by #79249.
Resolves rdar://145255592.