Allan Shortlidge fb03b4aa04 Sema: Relax availability checking for @MainActor. ...

The `@MainActor` global actor constraint on a declaration does not carry an
inherent ABI impact and therefore use of this constraint should not be limited
to OS versions where Swift concurrency is available.

Resolves rdar://105610970

2023-03-16 14:23:36 -07:00

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