Allan Shortlidge 5da4e2df40 Sema: Allow unavailable decls to witness requirements in more conformances. ...

In https://github.com/apple/swift/pull/63898 conformance requirement
typechecking was relaxed to allow unavailable decls to witness conformance
requirements as long as the conforming nominal was also unavailable. However,
only nominals that were directly marked unavailable were accepted. Nominals
that are declared in unavailable scopes should also be allowed to have
unavailable wintesses.

Resolves rdar://107052715

2023-03-22 12:37:51 -07:00

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