Allan Shortlidge 0647da5416 AST: Introduce an "always enabled" custom availability domain kind. ...

An always enabled availability domain is implicitly available in all contexts,
so uses of declarations that are marked as `@available` in the domain are never
rejected. This is useful for an availability domain representing a feature flag
that has become permanently enabled.

Partially resolves rdar://157593409.

2025-09-11 14:39:05 -07:00

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