o Add vm_map_unwire() for unwiring contiguous regions of either kernel

   or user vm_maps.  In accordance with the standards for munlock(2),
   and in contrast to vm_map_user_pageable(), this implementation does not
   allow holes in the specified region.  This implementation uses the
   "in transition" flag described below.
 o Introduce a new flag, "in transition," to the vm_map_entry.
   Eventually, vm_map_delete() and vm_map_simplify_entry() will respect
   this flag by deallocating in-transition vm_map_entrys, allowing
   the vm_map lock to be safely released in vm_map_unwire() and (the
   forthcoming) vm_map_wire().
 o Modify vm_map_simplify_entry() to respect the in-transition flag.

In collaboration with:	tegge

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