The case want to determine if a interrupt with higher priority and the
interrupt preemption occurred, but up_interrupt_context indicates that we
self inside interrupt/handler mode. As we previously did not handle the
ramvector interrupt correctly, after update breaked the case. We should
use a more clear private function is_nesting_interrupt.
Signed-off-by: buxiasen <buxiasen@xiaomi.com>
431b848c79