Add a script cache to the debugger...

test/mjsunit/debug-references.js

 // Copyright 2009 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 95 matching lines @@
 Debug.setListener(listener);
 
 // Test constructor and objects.
 function Point(x, y) { this.x_ = x; this.y_ = y;}
 p = new Point(0,0);
 q = new Point(1,2);
 
 // Enter debugger causing the event listener to be called.
 debugger;
 
-// Make sure that the debug event listener vas invoked.
+// Make sure that the debug event listener was invoked.
 assertFalse(exception, "exception in listener")
 assertTrue(listenerComplete, "listener did not run to completion");