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no longer any need for the page's PG_CACHED and PG_FREE flags to be set and cleared while the free page queues lock is held. Thus, vm_page_alloc(), vm_page_alloc_contig(), and vm_page_alloc_freelist() can wait until after the free page queues lock is released to clear the page's flags. Moreover, the PG_FREE flag can be retired. Now that the reservation system no longer uses it, its only uses are in a few assertions. Eliminating these assertions is no real loss. Other assertions catch the same types of misbehavior, like doubly freeing a page (see r260032) or dirtying a free page (free pages are invalid and only valid pages can be dirtied). Eliminate an unneeded variable from vm_page_alloc_contig(). Sponsored by: EMC / Isilon Storage Division