Do not trigger ExceptionEvents for another forwarding case

src/js/promise.js

 // Copyright 2012 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.
 
 (function(global, utils, extrasUtils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
@@ skipping 198 matching lines @@
                          deferred);
 
     SET_PRIVATE(promise, promiseFulfillReactionsSymbol, resolveCallbacks);
     SET_PRIVATE(promise, promiseRejectReactionsSymbol, rejectCallbacks);
   } else {
     maybeResolveCallbacks.push(onResolve, deferred);
     GET_PRIVATE(promise, promiseRejectReactionsSymbol).push(onReject, deferred);
   }
 }
 
-function PromiseIdResolveHandler(x) { return x }
-function PromiseIdRejectHandler(r) { throw r }
+function PromiseIdResolveHandler(x) { return x; }
+function PromiseIdRejectHandler(r) { %_ReThrow(r); }
 
 function PromiseNopResolver() {}
 
 // -------------------------------------------------------------------
 // Define exported functions.
 
 // For bootstrapper.
 
 // ES#sec-ispromise IsPromise ( x )
 function IsPromise(x) {
@@ skipping 412 matching lines @@
 utils.Export(function(to) {
   to.PromiseCastResolved = PromiseCastResolved;
   to.PromiseThen = PromiseThen;
 
   to.GlobalPromise = GlobalPromise;
   to.NewPromiseCapability = NewPromiseCapability;
   to.PerformPromiseThen = PerformPromiseThen;
 });
 
 })