AST: Reimplement AvailabilityContext storage using TrailingObjects
#79761
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This makes more efficient use of the permanent memory allocated for `AvailabilityContext` representations and also fixes a leak that was introduced in swiftlang#79718 where the small vector for unavailable domain storage was not being cleaned up on `ASTContext` deallocation. Resolves rdar://145929932.
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@swift-ci please smoke test |
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This makes more efficient use of the permanent memory allocated for
AvailabilityContextrepresentations and also fixes a leak that was introduced in #79718 where the small vector for unavailable domain storage was not being cleaned up onASTContextdeallocation.Resolves rdar://145929932.