Allan Shortlidge fb6ab05746 Concurrency: Restore -enable-experimental-feature IsolatedAny. ...

Supported older compilers don't enable this feature by default, so it can't be
omitted from the `_Concurrency` module's flags (regression from
https://github.com/swiftlang/swift/pull/74543).

Additionally, remove `@_allowFeatureSuppression(IsolatedAny)` from all
declarations. We no longer need to support compilers that don't have the
`IsolatedAny` feature, so the suppression is superfluous and the alternative
branches didn't actually build anyways. _Additionally_, the suppressible
feature logic could not handle suppressing `IsolatedAny` simultaneously with
`SendingArgsAndResults`, resulting in a broken interface because `sending` was
used outside `#if $SendingArgsAndResults` guards.

2024-07-03 10:36:47 -07:00

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