Replace the per-entry locks by a global HASH lock.

Since this lock is recursive we can now guarantee the atomicity of
pte_inser{32,64}() when a pted has to be removed first.  This fixes
one of the races.

Using a __mp_lock here also allowed dlg@ to provide me useful traces
to fix the next race.  Thanks for your help!

ok kettenis@, deraadt@, dlg@

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