Prepare for a new MARKER for non-NULL pointer. Reviewed-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@futurfusion.io> Reviewed-by: Fabiano Rosas <farosas@suse.de> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Peter Xu <peterx@redhat.com> Reviewed-by: Juraj Marcin <jmarcin@redhat.com> Link: https://lore.kernel.org/qemu-devel/20260401202844.673494-6-peterx@redhat.com Signed-off-by: Fabiano Rosas <farosas@suse.de>