Add unit test

Author: boingoing

test/Bugs/rlexe.xml

@@ -496,6 +496,13 @@
       <compile-flags>-force:deferparse -parserstatecache -useparserstatecache</compile-flags>
     </default>
   </test>
+  <test>
+    <default>
+      <files>skipping_nested_deferred_incorrect_function_id.js</files>
+      <tags>exclude_jshost</tags>
+      <compile-flags>-force:deferparse -parserstatecache -useparserstatecache</compile-flags>
+    </default>
+  </test>
   <test>
     <default>
       <files>withSplitScope.js</files>

test/Bugs/skipping_nested_deferred_incorrect_function_id.js

@@ -0,0 +1,13 @@
+//-------------------------------------------------------------------------------------------------------
+// Copyright (C) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
+//-------------------------------------------------------------------------------------------------------
+
+function test0(){
+  function a(b = function c() {}) { return () => { return 6; } };
+  [0].reduce(function d() {}, 0);
+  a()();
+}
+test0();
+
+console.log("pass");