illumos gate

Update from OpenZFS PR #13553:

    During sorted scrub multiple threads (one per vdev) are issuing many
    ZIOs same time, all using the same scn->scn_zio_root ZIO as parent.
    It causes huge lock contention on the single global lock on that ZIO.
    Improve it by introducing per-queue null ZIOs, children to that one,
    and using them instead as proxy.

    For 12 SSD pool storing 1.5TB of 4KB blocks on 80-core system this
    dramatically reduces lock contention and reduces scrub time from 21
    minutes down to 12.5, while actual read stages (not scan) are about
    3x faster, reaching 100K blocks per second per vdev.

    Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
    Signed-off-by: Alexander Motin <mav@FreeBSD.org>
    Sponsored-By: iXsystems, Inc.
    Closes #13553