[Concurrency] Provide a Swift interface for custom main and global executors. #80266
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We need to provide some of the additional functions, as stubs, for task-to-thread model. rdar://141348916
There were a couple of comments that needed updating, and a typo in a function name. rdar://141348916
Tweaked diagnostic to use a string instead of a type. Renamed the feature in `FeatureAvailability.def` (and added the `TaskExecutor` feature to 6.2). Also fixed the `swift_getActiveExecutor()` function to return the main executor only when on the main thread. rdar://141348916
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Rebased. |
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Reorganise the Concurrency code so that it's possible to completely implement executors (both main and global) in Swift.
Provide API to choose the desired executors for your application.
Also make
Task.Sleepwait using the current executor, not the global executor, and expose APIs onClockto allow for conversion between time bases.rdar://141348916