Fix exec/array_index_access_order test

exec/array_index_access_order.mj

@@ -6,7 +6,7 @@ class B {
             i[x] = (x = x + 1);
         }
         x = -1;
-        while(x < 4) {
+        while(x < 3) {
             System.out.println(i[(x = x + 1)]);
         }