DW:

DW:
 - Changed storeGetMemSpace so that it doesn't immediately exit
   if the store is in rebuilding phase.  Purging memory objects
   should be a "light" activity, so there should be no performance
   penalty.  If we don't purge memory objects during the rebuild
   phase, then memory usage grows without bounds until rebuilding
   is complete.  At high workloads this can cause malloc to fail.