Sema: Rationalize availability checking in unavailable contexts #83607
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Correct several behaviors of availability checking in unavailable contexts that were inconsistent with the checking model: - Avoid diagnosing unintroduced and obsolted declarations in contexts that are unavailable in the same domain. - Diagnose unavailability normally in type signature contexts.
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The bug tracked by rdar://158172056 was already fixed by swiftlang#83607 but this additional test case is needed to ensure that conformances to Obj-C protocols with obsolete requirements imported under legacy spellings not regress again.
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Correct several behaviors of availability checking in unavailable contexts that were inconsistent with the checking model:
Resolves rdar://158172056.