4747 remove unused [DS]SIZE_LIMIT defines
Reviewed by: Richard Lowe <richlowe@richlowe.net>
Approved by: Robert Mustacchi <rm@joyent.com>

6520051 segzio's sizing policy needs further optimization

4894692 caching data in heap inflates crash dump
6499454 time to increase size of kmem default allocation caches
6499459 vm should stop checking kvp directly

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