MFC r208765   In the unlikely event that pmap_ts_referenced() demoted five superpage   mappings to the same underlying physical page, the calling thread would   be left forever pinned to the same processor.
MFC r208765
  In the unlikely event that pmap_ts_referenced() demoted five superpage
  mappings to the same underlying physical page, the calling thread would
  be left forever pinned to the same processor.

Approved by:	re (kib)

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