[RFA]: x86_64 target files

[Kevin Buettner]

Jiri,

I haven't looked closely at your patch, but one of the things that I
did notice is that your target is not multi-arched.  I am fairly certain
that this will need to be done before your changes will be accepted.

For more information, see

    http://sources.redhat.com/gdb/papers/multi-arch/

Also, I am curious about the reasons for having two *-nat.c files.
I think that x86_64-linux-nat.c is fine, but I noticed that the
presumably more generic x86_64-nat.c still has ptrace() calls in
it.  It seems to me that it may be difficult for other operating
systems (such as those which don't use ptrace()) to make use of
this file.

Kevin