The circular import patch<->cmdutil is no problem, even without demandimport.
(don't ask me why, but importing one or the other works fine)

Therefore I pushed an updated version of 55860a45bbf2 to crew (not crew-stable)

For transplanting this to -stable the changesets 18a9fbb5cd78, 60acf1432ee0 and
da1658d63647 would need to be transplanted, too.

mpm, should this be done?

If not, a dummy dispatch module should be added to -stable to provide
dispatch.dispatch(), too.