Add support for //# sourceURL similar to deprecated //@ sourceURL one.

test/mjsunit/debug-set-script-source.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 18 matching lines @@
 // Get the Debug object exposed from the debug context global object.
 Debug = debug.Debug
 
 var script_number = 0;
 var script_names = [];
 var exception = null;
 
 function listener(event, exec_state, event_data, data) {
   if (event == Debug.DebugEvent.BeforeCompile) {
     event_data.script().setSource(event_data.script().source() +
-        " //@ sourceURL=proper_location_" + (++script_number));
+        " //# sourceURL=proper_location_" + (++script_number));
   } else if (event == Debug.DebugEvent.AfterCompile) {
     try {
-      event_data.script().setSource("a=1 //@ sourceURL=wrong_location");
+      event_data.script().setSource("a=1 //# sourceURL=wrong_location");
     } catch(e) {
       exception = e;
     }
     script_names.push(event_data.script().name());
   }
 };
 
 
 // Add the debug event listener.
 Debug.setListener(listener);
 
 // Compile different sources.
 eval('a=1');
 eval('(function(){})');
 
 assertEquals(2, script_names.length);
 assertEquals("proper_location_1", script_names[0]);
 assertEquals("proper_location_2", script_names[1]);
 
 assertEquals("illegal access", exception);
 
 Debug.setListener(null);