Removal of race conditions. Inspired by Charles Hannum's

Removal of race conditions.  Inspired by Charles Hannum's
<mycroft@netbsd.org> reorganization of the vm_collapse logic, although not
used verbatim.  We no longer collapse objects from the pagedaemon as that
is not necessary anymore with the more aggressive collapses that gets done.
This also increases performance of loaded systems.  Much KNF too.