Promises: Make PromiseSet operation monomorphic

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 131 matching lines @@
 }
 
 function FulfillPromise(promise, status, value, promiseQueue) {
   if (GET_PRIVATE(promise, promiseStateSymbol) === kPending) {
     var tasks = GET_PRIVATE(promise, promiseQueue);
     if (!IS_UNDEFINED(tasks)) {
       var tasks = GET_PRIVATE(promise, promiseQueue);
       var deferreds = GET_PRIVATE(promise, promiseDeferredReactionsSymbol);
       PromiseEnqueue(value, tasks, deferreds, status);
     }
-    PromiseSet(promise, status, value);
+    SET_PRIVATE(promise, promiseStateSymbol, status);
+    SET_PRIVATE(promise, promiseResultSymbol, value);
   }
 }
 
 function PromiseHandle(value, handler, deferred) {
   var debug_is_active = DEBUG_IS_ACTIVE;
   try {
     if (debug_is_active) %DebugPushPromise(deferred.promise, PromiseHandle);
     var result = handler(value);
     deferred.resolve(result);
   } catch (exception) {
@@ skipping 420 matching lines @@
   to.PromiseChain = PromiseChain;
   to.PromiseDefer = PromiseDefer;
   to.PromiseAccept = PromiseAccept;
 
   to.PromiseCreateRejected = PromiseCreateRejected;
   to.PromiseCreateResolved = PromiseCreateResolved;
   to.PromiseThen = PromiseThen;
 });
 
 })