Add inspection of arguments for optimized frames

test/mjsunit/debug-evaluate-locals-optimized.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 23 matching lines @@
 
 
 function listener(event, exec_state, event_data, data) {
   try {
     if (event == Debug.DebugEvent.Break)
     {
       assertEquals(6, exec_state.frameCount());
 
       for (var i = 0; i < exec_state.frameCount(); i++) {
         var frame = exec_state.frame(i);
-        // All frames except the bottom one has normal variables a and b.
         if (i < exec_state.frameCount() - 1) {
+          // All frames except the bottom one has normal variables a and b.
           assertEquals('a', frame.localName(0));
           assertEquals('b', frame.localName(1));
           assertEquals(i * 2 + 1, frame.localValue(0).value());
           assertEquals(i * 2 + 2, frame.localValue(1).value());
+
+          // All frames except the bottom one has arguments variables x and y.
+          assertEquals('x', frame.argumentName(0));
+          assertEquals('y', frame.argumentName(1));
+          assertEquals((i + 1) * 2 + 1, frame.argumentValue(0).value());
+          assertEquals((i + 1) * 2 + 2, frame.argumentValue(1).value());
         }
 
         // Check the frame function.
         switch (i) {
           case 0: assertEquals(h, frame.func().value()); break;
           case 1: assertEquals(g3, frame.func().value()); break;
           case 2: assertEquals(g2, frame.func().value()); break;
           case 3: assertEquals(g1, frame.func().value()); break;
           case 4: assertEquals(f, frame.func().value()); break;
           case 5: break;
@@ skipping 61 matching lines @@
   g1(a, b);
 };
 
 f(11, 12);
 
 // Make sure that the debug event listener vas invoked.
 assertFalse(exception, "exception in listener " + exception)
 assertTrue(listenerComplete);
 
 Debug.setListener(null);