Various small changes to PV entry management:

Constify pc_freemask[].

pmap_pv_reclaim()
  Eliminate "freemask" because it was a pessimization.  Add a comment about
  the resident count adjustment.

free_pv_entry() [i386 only]
  Merge an optimization from amd64 (r233954).

get_pv_entry()
  Eliminate the move to tail of the pv_chunk on the global pv_chunks list.
  (The right strategy needs more thought.  Moreover, there were unintended
  differences between the amd64 and i386 implementation.)

pmap_remove_pages()
  Eliminate unnecessary ()'s.

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