Check for super using OP_ARGARY; fix #3678

It generates a wasted empty array for each `super` call though.
It should be fixed in the future, if possible.

mrbgems/mruby-compiler/core/codegen.c

@@ -1939,9 +1939,19 @@ codegen(codegen_scope *s, node *tree, int val)
 
   case NODE_SUPER:
     {
+      codegen_scope *s2 = s;
+      int lv = 0;
       int n = 0, noop = 0, sendv = 0;
 
       push();        /* room for receiver */
+      while (!s2->mscope) {
+        lv++;
+        s2 = s2->prev;
+        if (!s2) break;
+      }
+      genop(s, MKOP_ABx(OP_ARGARY, cursp(), (lv & 0xf)));
+      push(); push();         /* ARGARY pushes two values */
+      pop(); pop();
       if (tree) {
         node *args = tree->car;
         if (args) {