[debug-wrapper] Further extend the debug wrapper

test/mjsunit/regress/regress-crbug-605581.js

-// Copyright 2016 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Flags: --expose-debug-as debug
-
-var Debug = debug.Debug;
-var exception = null;
-
-function listener(event, exec_state, event_data, data) {
-  if (event != Debug.DebugEvent.Break) return;
-  try {
-    assertThrows(() => exec_state.frame(0).evaluate("bar.baz"), ReferenceError);
-  } catch (e) {
-    exception = e;
-  }
-}
-
-Debug.setListener(listener);
-
-(function() {
-  debugger;    // bar is still in TDZ at this point.
-  let bar = 1;
-  (x => bar);  // force bar to be context-allocated.
-})();
-
-Debug.setListener(null);
-assertNull(exception);