Allan Shortlidge b047396246 AST: Use availability to control decl visibility in public swiftinterfaces. ...

Declarations that are unavailable at runtime because of an `@available`
attribute referencing a custom domain that was imported `@_spiOnly` should be
hidden from public swiftinterface files in `-library-level=api` modules. For
remaining declarations that do get printed in the public swiftinterface, skip
printing any `@available` attribute that refers to the domains from those
`@_spiOnly` dependencies. This allows API developers to control declaration
visibility using availability defined by another module.

Resolves rdar://156512028.

2025-09-04 12:32:19 -07:00

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