7297 clear() on llquantize aggregation causes dtrace to exit
7298 printa() of multiple aggregations can fail for llquantize()

illumos/illumos-gate@0ddc0ebb74cedb0ac394818c6e166c47eb8e62e5

Reviewed by: Patrick Mooney <patrick.mooney@joyent.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Reviewed by: Adam Leventhal <adam.leventhal@gmail.com>
Approved by: Richard Lowe <richlowe@richlowe.net>
Author: Bryan Cantrill <bryan@joyent.com>