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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Use native atomic function instead of DTrace's own one

So we don't need to implement it for each architecture.

This change is from FreeBSD (not as-is though).

Fix wrong conditional statement in dtrace_debug_output

Reported in PR kern/48547 by ozaki-r.

add a stub for arm

reduce diff to freebsd:
rename "xcpu" back to "cpu" now that the conflicting global variable
has been renamed out of the way. this also fixes some cases
where references to the local variable "cpu"

reduce diff to freebsd:
rename "xcpu" back to "cpu" now that the conflicting global variable
has been renamed out of the way. this also fixes some cases
where references to the local variable "cpu" had not been renamed
and thus were accidentally referring to the former global "cpu".

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fix shadow warnings.
XXX: might be a good idea to kill global 'cpu' and 'version' variables.

make dtrace compile on amd64.

Apply NetBSD changes to DTrace.

Ok with core@.

Add the FreeBSD 8-RC1 changes for DTrace.

Ok with core@.