pmap_remove:

  Avoid re-walking the page table from the root for every PTE examined.

  Tidy up some of pmap_remove()'s helper functions.

pmap_enter:

  Set PV_TABLE_REF whenever the physical page being mapped is managed, not
  just when it is writeable.

  Only call pmap_update_page() when the old mapping was valid.  If there was
  no prior valid mapping, then pmap_update_page() serves no useful purpose.
  However, it will interrupt every processor that has the pmap active.

pmap_enter_quick_locked:

  Always set PTE_RO.

pmap_emulate_modified:

  Don't set PV_TABLE_REF.

  Eliminate a nonsensical comment.

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