misc/assert: restore assertion registers to array of last registers

Some assertions in extreme cases will cause syslog to be unable to
output logs normally, so this PR will restore the input registers
into the array of last registers to ensure that we can also obtain
some important informations.

Signed-off-by: chao an <anchao@xiaomi.com>

sched/misc/assert.c

@@ -581,6 +581,10 @@ void _assert(FAR const char *filename, int linenum,
       up_saveusercontext(g_last_regs);
       regs = g_last_regs;
     }
+  else
+    {
+      memcpy(g_last_regs, regs, sizeof(g_last_regs));
+    }
 
 #if CONFIG_BOARD_RESET_ON_ASSERT < 2
   if (!up_interrupt_context() &&