avm2: Throw ArgumentError when trying to construct `new Worker()`

core/src/avm2/globals/flash/system/Worker.as

@@ -1,7 +1,9 @@
 package flash.system {
     public final class Worker {
-        public function Worker() {}
-        
+        public function Worker() {
+            throw new ArgumentError("Error #2012: Worker$ class cannot be instantiated.", 2012);
+        }
+
         public static function get isSupported():Boolean {
             return false;
         }