x86-64: move save_paranoid into .kprobes.text

Impact: mark save_paranoid as non-kprobe-able code

This appears to be necessary as the function gets called from
kprobes-unsafe exception handling stubs (i.e. which themselves
live in .kprobes.text).

Signed-off-by: Jan Beulich <jbeulich@novell.com>
LKML-Reference: <49B8F44F.76E4.0078.0@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>