swift

29b8e6e6 - [Concurrency] Un-gate implicit nonisolated access to struct vars and isolated

[Concurrency] Un-gate implicit nonisolated access to struct vars and isolated subclassing. These features are additive, and they don't need to be gated behind the `GlobalActorIsolatedTypesUsability` upcoming feature. The other inference changes, including `@Sendable` inference for global-actor-isolated function types, and global-actor inference on protocol refinements, remain gated behind the upcoming flag.