Fix the debugger for strict-mode functions.

test/mjsunit/debug-scopes.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 290 matching lines @@
 
 listener_delegate = function(exec_state) {
   CheckScopeChain([debug.ScopeType.Local,
                    debug.ScopeType.Global], exec_state);
   CheckScopeContent({a:1,b:2,x:3,y:4,i:5,j:6}, 0, exec_state);
 };
 local_7(1, 2);
 EndTest();
 
 
+// Simple empty local scope but for a strict-mode function where the
+// receiver is undefined.
+BeginTest("Local 8");
+
+function local_8() {
+  "use strict";
+  debugger;
+}
+
+listener_delegate = function(exec_state) {
+  CheckScopeChain([debug.ScopeType.Local,
+                   debug.ScopeType.Global], exec_state);
+  CheckScopeContent({}, 0, exec_state);
+};
+local_8();
+EndTest();
+
+
 // Single empty with block.
 BeginTest("With 1");
 
 function with_1() {
   with({}) {
     debugger;
   }
 }
 
 listener_delegate = function(exec_state) {
@@ skipping 551 matching lines @@
   CheckScopeContent({y:98}, 2, exec_state);
 };
 catch_block_4();
 EndTest();
 
 
 assertEquals(begin_test_count, break_count,
              'one or more tests did not enter the debugger');
 assertEquals(begin_test_count, end_test_count,
              'one or more tests did not have its result checked');