Trigger exception debug events on Promise reject.

test/mjsunit/es6/debug-promises/reentry.js

 // Copyright 2014 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
 
 // Test reentry of special try catch for Promises.
 
 Debug = debug.Debug;
 
 Debug.setBreakOnUncaughtException();
 Debug.setListener(function(event, exec_state, event_data, data) { });
 
 var p = new Promise(function(resolve, reject) { resolve(); });
 var q = p.chain(function() {
   new Promise(function(resolve, reject) { resolve(); });
 });