Add this_arg dumping in parser

tests/jerry/N.this_arg.js

@@ -0,0 +1,26 @@
+// Copyright 2014 Samsung Electronics Co., Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+var i = 0;
+
+function a() {}
+
+a.prototype.b = function() { i++; }
+
+a.prototype.c = function() { this.b(); i++; }
+
+var aa = new a();
+aa.c();
+
+assert (i === 2);