Nate Chandler b03904d704 [Freestanding] Use task-to-thread concurrency model. ...

Defined SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY to describe
whether the standard library will use the task-to-thread model for
concurrency.  It is true only for freestanding non-Darwin stdlibs.

When it is true, SWIFT_CONCURRENCY_TASK_TO_THREAD_MODEL is defined
during stdlib compilation of both Swift and C++ sources.

Added an option to LangOptions to specify which concurrency model is
used, either standard or task-to-thread.  When
SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY is true, the model is
specified to be task-to-thread.

2022-07-06 11:51:14 -07:00

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