[Tim]
> ...
> Now under 3.7.3.  First when phase 10 is done building:
>
> phase 10 adding 9953410
> phase 10 has 16743920 objects
>
> # arenas allocated total           =               14,485
> # arenas reclaimed                 =                2,020
> # arenas highwater mark            =               12,465
> # arenas allocated current         =               12,465
> 12465 arenas * 262144 bytes/arena  =        3,267,624,960
>
> # bytes in allocated blocks        =        3,216,219,656
>
> Space utilization is again excellent.  A significant number of arenas
> were reclaimed - but usefully?

Nope!  Digging through all the output, all the arena recycling
happened in the "_add_ millions of objects" stages, never in the
"delete millions of objects" stages.  So it was just more accidental
arena thrashing (which was recently repaired in bpo-37257).
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