Follow-up to D20926 (committed as r271595, r271596).
This patch is in preparation for a substantial refactoring of the code.
No functionality changed.
To elaborate a bit here: what's happening is that the update the list sees
is that you added the list and some reviewers, rather than an initial email
that contains the patch and your description of it so that people can scan
and look at patches without needing to go to phabricator.