merge a new version of the CDDL dtrace and ZFS code.
this changes the upstream vendor from OpenSolaris to FreeBSD,
and this version is based on FreeBSD svn r315983.

in addition to the 10 years of im

merge a new version of the CDDL dtrace and ZFS code.
this changes the upstream vendor from OpenSolaris to FreeBSD,
and this version is based on FreeBSD svn r315983.

in addition to the 10 years of improvements from upstream,
this version also has these NetBSD-specific enhancements:
- dtrace FBT probes can now be placed in kernel modules.
- ZFS now supports mmap().

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import new CDDL dtrace and ZFS code from FreeBSD svn r315983.

Import new Opensolaris sources for zfs/dtrace.

Opensolaris mercurial changeset: 11751:58c0c8f4305f

Import Opensolaris source code used with zfs port. Zfs code si from date
200811.