vm_page: use ref_count for NOFREE counter
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Authored by dougm on May 2 2025, 1:42 AM.

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rG2735c20d114f: vm_page: use ref_count for NOFREE counter

Summary

In managing freed PG_NOFREE pages, use ref_count instead of pindex for counting pages in freed PG_NOFREE blocks. No change in behavior is expected. This restores the (useful) property that the pindex field is of interest only for pages that are mapped to objects.