kernel: Use DEVMETHOD_END in the drivers.

Initial import of binutils 2.22 on the new vendor branch

Future versions of binutils will also reside on this branch rather
than continuing to create new binutils branches for each new version.

kernel: Use NULL for DRIVER_MODULE()'s evh & arg (which are pointers).

This is just cosmetics for easier reading.

AMD64 - Sync AMD64 support from Jordan Gordeev's svn repository and
Google SOC project. This work is still continuing but represents
substantial progress in the effort.

With this commit the world b

AMD64 - Sync AMD64 support from Jordan Gordeev's svn repository and
Google SOC project. This work is still continuing but represents
substantial progress in the effort.

With this commit the world builds and installs, the loader is able to
boot the kernel, and the kernel is able to initialize, probe devices, and
exec the init program. The init program is then able to run until it hits
its first fork(). For the purposes of the GSOC the project is being
considered a big success!

The code has been adapted from multiple sources, most notably Peter Wemm
and other peoples work from FreeBSD, with many modifications to make it
work with DragonFly. Also thanks go to Simon Schubert for working on gdb
and compiler issues, and to Noah Yan for a good chunk of precursor work
in 2007.

While Jordan wishes to be modest on his contribution, frankly we would
not have been able to make this much progress without the large number
of man-hours Jordan has dedicated to his GSOC project painstakingly gluing
code together, tracking down issues, and progressing the boot sequence.

Submitted-by: Jordan Gordeev <jgordeev@dir.bg>

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Remove inclusion of <sys/cdefs.h> from kernel .c files.

They are not needed and mostly leftovers from former __FBSDID and the
likes.

Also add some missing CVS ids to the comments.