Small step towards unifying traps_32|64.c.  No functional
changes.  Pull out a small helper from an if() statement
in die().

Marked as __kprobes as eventually we will want to call this
from do_page_fault similar to how X86_64 does it.
Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>