- remove all calls to sched_pin and sched_unpin as they are only useful to

  pmap on i386
- check for change in executable status in pmap_enter
- pmap_qenter and pmap_qremove only need to invalidate the range if one
  of the pages has been referenced
- remove pmap_kenter/pmap_kremove as they were only used by pmap_qenter
  and pmap_qremove
- in pmap_copy don't copy wired bit to destination pmap
- mpte was unused in pmap_enter_object - remove
- pmap_enter_quick_locked is not called on the kernel_pmap, remove check
- move pmap_remove_write specific logic out of tte_clear_phys_bit
- in pmap_protect check for removal of execute bit
- panic in the presence of a wired page in pmap_remove_all
- pmap_zero_range can call hwblkclr if offset is zero and size is PAGE_SIZE
- tte_clear_virt_bit is only used by pmap_change_wiring - thus it can be
  greatly simplified
- pmap_invalidate_page need only be called in tte_clear_phys_bit if there
  is a match with flags
- lock the pmap in tte_clear_phys_bit so that clearing the page bits is
  atomic with invalidating the page

- these changes result in 100s reduction in buildworld from a malloc backed
  disk to a malloc backed disk - ~2.5%

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