o Introduce an argument, VM_ALLOC_WIRED, that requests vm_page_alloc()

   to return a wired page.
 o Use VM_ALLOC_WIRED within Alpha's pmap_growkernel().  Also, because
   Alpha's pmap_growkernel() calls vm_page_alloc() from within a critical
   section, specify VM_ALLOC_INTERRUPT instead of VM_ALLOC_SYSTEM.  (Only
   VM_ALLOC_INTERRUPT is implemented entirely with a spin mutex.)
 o Assert that the page queues mutex is held in vm_page_wire()
   on Alpha, just like the other platforms.

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