More PMAP concurrency improvements: replace the table lock and (almost) all uses of the page queues mutex with a new rwlock that protects the page table and the PV lists. This reduces system time during a parallel buildworld by 35%.
More PMAP concurrency improvements: replace the table lock and (almost) all
uses of the page queues mutex with a new rwlock that protects the page
table and the PV lists. This reduces system time during a parallel
buildworld by 35%.

Reviewed by:	alc

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