Eliminate duplication of the pmap and pv list unlock operations in
pmap_enter() by implementing a single return path.  Otherwise, the
duplication will only increase with the upcoming support for psind == 1.

Extract the innermost loop of pmap_remove() out into its own function,
pmap_remove_ptes().  (This new function will also be used by an upcoming
change to pmap_enter() that adds support for psind == 1 mappings.)

Add support for pmap_enter(..., psind=1) to the amd64 pmap.  In other words,
add support for explicitly requesting that pmap_enter() create a 2MB page
mapping.  (Essentially, this feature allows the machine-independent layer to
create superpage mappings preemptively, and not wait for automatic promotion
to occur.)

Export pmap_ps_enabled() to the machine-independent layer.

Add a flag to pmap_pv_insert_pde() that specifies whether it should fail or
reclaim a PV entry when one is not available.

Refactor pmap_enter_pde() into two functions, one by the same name, that is
a general-purpose function for creating PDE PG_PS mappings, and another,
pmap_enter_2mpage(), that is used to prefault 2MB read- and/or execute-only
mappings for execve(2), mmap(2), and shmat(2).