Pavel Yaskevich b046efccc1 [Concurrency] Downgrade errors when isolated member is referenced from a preconcurrency context ...

Such references used to be downgraded until Swift 6 but since the
context is `@preconcurrency` it should be possible for API authors
to introduce concurrency annotations such as `@Sendable` without
breaking clients even when they are compiled in Swift 6 mode.

Resolves: rdar://157061896

2025-07-30 11:02:40 -07:00

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