New PV entry allocator for pmap-v6.c

[Zbyszek Bodek]

Hello everyone,

As a part of Semihalf work on Superpages support,
we've made some pmap-v6.c improvements and clean-ups.

We would like to start integrating our code to the mainline FreeBSD,
therefore I'm happy to introduce the new PV entry allocator for 
pmap-v6.c ported from amd64/i386/mips.

Alan Cox (alc) was so kind to review the code.

If there are no objections, then we will commit this patch to the HEAD 
around Monday/Tuesday.

Please check out the attachment for details.

Best regards
Zbyszek Bodek
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