Doug Gregor 8ff7e0b3ab Look to enclosing declarations for @available attributes on @_nonSendable types ...

`@_nonSendable` types get a synthesized, unavailable extension that
declares the Sendable conformance. This extension also needs to have
appropriate platform availability for the type that is being marked
non-Sendable, so the platform-specific attributes are copied from the
nominal type declaration. However, for nested types, we might need to
copy those attributes from an enclosing declarations. Do so when
appropriate.

Fixes rdar://90330588.

2022-07-06 22:16:16 -07:00

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