Further reduce the use of Giant in vm_map_delete(): Perform pmap_remove() on system maps, besides the kmem_map, without Giant.
Further reduce the use of Giant in vm_map_delete(): Perform pmap_remove()
on system maps, besides the kmem_map, without Giant.

In collaboration with:	tegge

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase