perf: optimize recursion, avoid stackoverflow on larger scripts (#2672)

libsrc/ffdec_lib/testdata/as3_long/src/Main.as

@@ -0,0 +1,28 @@
+package
+{
+    import flash.display.Sprite;
+    import flash.events.Event;
+    import tests.*;
+    /**
+     * ...
+     * @author JPEXS
+     */
+    public class Main extends Sprite
+    {
+        TestLongScript;
+        
+        public function Main()
+        {
+            if (stage) init();
+            else addEventListener(Event.ADDED_TO_STAGE, init);
+        }
+        
+        private function init(e:Event = null):void
+        {
+            removeEventListener(Event.ADDED_TO_STAGE, init);
+            // entry point
+        }    
+    
+    }
+
+}