Rework the changes to DTRACE/ZFS files that were fixing Clang/LLVM build

Rever changes to upstream files and replace them with additional -Wno-
compiler argument flags.

Tested with base LLVM.

Requ

Rework the changes to DTRACE/ZFS files that were fixing Clang/LLVM build

Rever changes to upstream files and replace them with additional -Wno-
compiler argument flags.

Tested with base LLVM.

Requested by <chuq>

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Correct compilation of osnet/dev/systrace/systrace.c under Clang

Mark arguments to dtrace_probe_lookup() with __UNCONST().
The proper fix constifying it causes pollution of const in too many files.

Correct compilation of osnet/dev/systrace/systrace.c under Clang

Mark arguments to dtrace_probe_lookup() with __UNCONST().
The proper fix constifying it causes pollution of const in too many files.

This could be done with -W flags, but they are incompatible between
compilers.

This is a step forward functional MKLLVM=yes HAVE_LLVM=yes build.

Sponsored by <The NetBSD Foundation>

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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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PR/51118: Jared McNeill: Fix build on FreeBSD by removing osnet assert.h
and sys/limits.h and use sys/syslimits.h directly.

use the alternate syscall names if available

fix reversed test.

we have space for 2 more arguments so use it.

- cleanup FreeBSD ifdefs
- remove unused code
- adjust to NetBSD struct emul and types.

Replace llx with PRIx64 and some llu with PRIu64 in format strings.

Retire varargs.h support. Move machine/stdarg.h logic into MI
sys/stdarg.h and expect compiler to provide proper builtins, defaulting
to the GCC interface. lint still has a special fallback.
Reduce a

Retire varargs.h support. Move machine/stdarg.h logic into MI
sys/stdarg.h and expect compiler to provide proper builtins, defaulting
to the GCC interface. lint still has a special fallback.
Reduce abuse of _BSD_VA_LIST_ by defining __va_list by default and
derive va_list as required by standards.

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Apply NetBSD changes to DTrace.

Ok with core@.

Add the FreeBSD 8-RC1 changes for DTrace.

Ok with core@.