Don't KASSERT in pmap_release that   xpmap_ptom(VM_PAGE_TO_PHYS(m)) == (pmap->pm_pdpt[i] & PG_FRAME) for i = NPGPTD, since pmap->pm_pdpt[i] is only initialized for 0 <= i < NPGPTD.
Don't KASSERT in pmap_release that
  xpmap_ptom(VM_PAGE_TO_PHYS(m)) == (pmap->pm_pdpt[i] & PG_FRAME)
for i = NPGPTD, since pmap->pm_pdpt[i] is only initialized for
0 <= i < NPGPTD.

This fixes an inevitable panic with XEN && PAE && INVARIANTS when
pmap_release is called (e.g., when /sbin/init is launched).

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