kernel - Change pager interface to pass page index 3/*

kernel - Change pager interface to pass page index 3/*

* Don't shortcut vm_object_page_remove() with a resident_page_count
  test for MGTDEVICE objects.  These objects are not required to have
  their VM pages entered into them.

* in vm_object_page_remove(), change pmap_remove_pages() to
  pmap_remove().  The former is meant to be used only in the
  exit code and does not bother with TLB synchronization.
  pmap_remove() properly handles any TLB synchronization.