VM: fix pageout on low memory

Instead of determining if memory is low, directly use the
vm_page_alloc_paused variable, which is true when memory has reached
a minimum threshold until it gets back above the high thresholds.

This makes sure double paging is used when external pagers are unable
to allocate memory.

* vm/vm_page.c (vm_page_seg_evict): Rename low_memory to alloc_paused.
(vm_page_evict_once): Remove low_memory and its computation. Blindly
pass the new alloc_paused argument instead.
(vm_page_evict): Pass the value of vm_page_alloc_paused to
vm_page_evict_once.

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