Pavel Yaskevich 9b8e53c0a1 [Concurrency] Check whether @preconcurrency is supported before adding it ...

Don't trasfer "preconcurrency" from isolation onto a declaration if
the declaration doesn't support it. This is especially important for
`MainActor` by default mode where each `@MainActor` injection site
gets marked as `@preconcurrency` implicitly in pre-6 language modes.

Resolves: https://github.com/swiftlang/swift/issues/85564

2026-02-03 10:29:59 -08:00

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