Here is an alternate fix for chromium:1123379, which addresses a
TODO. A callback is provided to the GraphAssembler when it's working
on an unscheduled graph. In such cases, changed nodes in the main
graph need to be revisited after change. The callback ensures that
the GraphAssembler kicks that process off when necessary.

Bug: chromium:1123379
Change-Id: I9d864c3390fbe670ee450152a67555dcbfa8f581
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2433924
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70192}