3974 mistake on stdlib.h
Reviewed by: Alexander Pyhalov <alp@rsu.ru>
Reviewed by: Gary Mills <gary_mills@fastmail.fm>
Approved by: Dan McDonald <danmcd@nexenta.com>
4046 dsl_dataset_t ds_dir->dd_lock is highly contended
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Approved by: Garrett D'Amore <garrett@damore.org>
	[illumos-gate merge]

commit b62969f868a827f0823a084bc0af9c7d8b76c659
    4046 dsl_dataset_t ds_dir->dd_lock is highly contended
commit 60c49c69080806d302eecdc7c8f69a0b88cac397
    3974 mistake on stdlib.h