Allan Shortlidge 54e6900c36 Sema: Skip diagnosing witness availability for unavailable conformances. ...

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 https://github.com/swiftlang/swift/pull/79249.

Resolves rdar://145255592.

2025-02-20 22:42:00 -08:00

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