In some IST handlers, if the interrupt came from user mode,
we can safely enable preemption.  Add helpers to do it safely.

This is intended to be used my the memory failure code in
do_machine_check.
Acked-by: NBorislav Petkov <bp@suse.de>
Signed-off-by: NAndy Lutomirski <luto@amacapital.net>