int3 handler better address space detection on interrupts

int3 handler better address space detection on interrupts

In order to prepare the possibility to dynamically change an
interrupt handler code with static_branch_enable/disable,
as the interrupt can equally appear while in user space or
kernel space, the int3 handler itself must better identify if
the original interrupt is from kernel or userland.

Signed-off-by: William Roche <william.roche@oracle.com>
Co-developed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Signed-off-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
(cherry picked from commit 594fc07cd96784004254680c9e1e4b757fb0a1f5)

Orabug: 29660924

Signed-off-by: William Roche <william.roche@oracle.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Acked-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Conflicts:
	arch/x86/entry/entry_64.S
entry/entry_64.S vs kernel/entry_64.S in UEK4

Signed-off-by: Brian Maly <brian.maly@oracle.com>