Konrad `ktoso` Malawski d4ebc58754 [Concurrency] Fix group child tasks not being released ...

The proper handling of task group child tasks is that:
- if it completes a waiting task immediately, we don't need to retain it
  - we just move the value to the waiting task and can destroy the task
- if we need to store the ready task and wait for a waiting task (for a
  task that hits `await group.next()`) then we need to retain the ready
  task.
  - as the waiting task arrives, we move the value from the ready task
    to the waiting task, and swift_release the ready task -- it will now
    be destroyed safely.

2021-09-04 20:00:39 +09:00

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