Erik Eckstein 93367ed587 concurrency: make the startAsyncLet closure no-escaping ...

The closure does not escape the startAsyncLet - endAsyncLet scope. Even though it's (potentially) running on a different thread.

The substantial change in the runtime is to not call swift_release on the closure context if it's a non-escaping closure.

2021-04-20 21:57:19 +02:00

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