Commits on Dec 1, 2022

1. rt: fix new yield_now behavior with block_in_place …

   PR #5223 changed the behavior of `yield_now()` to store yielded tasks
   and notify them *after* polling the resource drivers. This PR fixes a
   couple of bugs with this new behavior when combined with
   `block_in_place()`.
   
   First, we need to avoid freeing the deferred task queue when exiting a
   runtime if it is *not* the root runtime. Because `block_in_place()`
   allows a user to start a new runtime from within an existing task, this
   check is necessary.
   
   Second, when a worker core is stolen from a thread during a
   `block_in_place()` call, we need to ensure that deferred tasks are
   notified anyway.

   

   carllerche committed Dec 1, 2022
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