Crash early if calling SuspendableWorkQueue::dispatch() with a null Function instead of crashing asynchronously on the background thread. This is to help debug the root cause of <rdar://105807359>.
Pull request: https://github.com/WebKit/WebKit/pull/14883
Committed 265100@main (68b841ffaf2c): <https://commits.webkit.org/265100@main> Reviewed commits have been landed. Closing PR #14883 and removing active labels.