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

test/mjsunit/debug-setbreakpoint.js

 // Copyright 2008 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 128 matching lines @@
 function f() {
   a=1
 };
 
 function g() {
   // Comment.
   f();
 };
 
 eval('function h(){}');
-eval('function sourceUrlFunc() { a = 2; }\n//@ sourceURL=sourceUrlScript');
+eval('function sourceUrlFunc() { a = 2; }\n//# sourceURL=sourceUrlScript');
 
 o = {a:function(){},b:function(){}}
 
 // Check the script ids for the test functions.
 f_script_id = Debug.findScript(f).id;
 g_script_id = Debug.findScript(g).id;
 h_script_id = Debug.findScript(h).id;
 sourceURL_script_id = Debug.findScript(sourceUrlFunc).id;
 
 assertTrue(f_script_id > 0, "invalid script id for f");
@@ skipping 48 matching lines @@
   Debug.setScriptBreakPoint(Debug.ScriptBreakPointType.ScriptId,
                             i_script.id, 4);
 }
 
 // Creates the eval script and tries to set the breakpoint.
 // The tricky part is that the script function must be strongly reachable at the
 // moment. Since there's no way of simply getting the pointer to the function,
 // we run this code while the script function is being activated on stack.
 eval('SetBreakpointInI1Script()\nfunction i1(){}\n\n\n\nfunction i2(){}\n');