x86 CPU support, better support for powerpc64, some new directives, and
many other things. Bump __FreeBSD_version, and add a note to UPDATING.
Thanks to the many people that have helped to test this.
Obtained from: projects/binutils-2.17
just before the memory hole to 4 megs. Special case building exception.s
like locore.s, it needs to at the beginning so the branches out from the
trap table don't overflow.