John McCall a76b304f00 Allow building a concurrent libSwiftConcurrency without libdispatch ...

The goal here is not to eventually implement a concurrent thread
pool ourselves.  We're just making it easier for integrators who
have their own pool and don't want to use Dispatch to build the
Swift concurrency runtime.  Just hook the right functions and
you should be fine.

The necessary functions to hook are:
- swift_task_enqueueGlobal
- swift_task_enqueueGlobalAfterDelay

The following functions *would* be necessary to hook:
- swift_task_enqueueMainExecutor
- swift_task_asyncMainDrainQueue (only if you have an async main?)
However, this configuration does not currently properly support
the main executor, and so `@MainActor` should be avoided for now.

rdar://83513751

2021-10-01 02:15:03 -04:00

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