dillon1000/react

Remove renderPhaseUpdates Map (#17625)

* Remove renderPhaseUpdates Map

Follow up to #17484, which was reverted due to a bug found in www.

* Failing test: Dropped updates

When resetting render phase updates after a throw, we should only clear
the pending queue of hooks that were already processed.

* Fix non-render-phase updates being dropped

Detects if a queue has been processed by whether the hook was cloned.
If we change the implementation to an array instead of a list, we'll
need some other mechanism to determine whether the hook was processed.

* Regression test: startTransition in render phase

useTransition uses the state hook as part of its implementation, so we
need to fork it in the dispatcher used for re-renders, too.