Illumos 5562 - ZFS sa_handle's violate kmem invariants, debug kernels panic on boot

5562 ZFS sa_handle's violate kmem invariants, debug kernels panic on boot
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Robert Mustacchi <rm@fingolfin.org>
Reviewed by: George Wilson <george@delphix.com>
Reviewed by: Rich Lowe <richlowe@richlowe.net>
Approved by: Dan McDonald <danmcd@omniti.com>

References:

https://www.illumos.org/issues/5562
https://github.com/illumos/illumos-gate/commit/0fda3cc5

Ported-by: DHE <git@dehacked.net>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3388