Eliminate a possible race between pmap_pinit() and pmap_kenter_pde() on superpage promotion or demotion.
Eliminate a possible race between pmap_pinit() and pmap_kenter_pde() on
superpage promotion or demotion.

Micro-optimize pmap_kenter_pde().

Reviewed by:	kib, jhb (an earlier version)
MFC after:	1 week

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