[async-await] Remove call indirection in Create and Reject

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 18 matching lines @@
 // -------------------------------------------------------------------
 // Define exported functions.
 
 // For bootstrapper.
 
 // This is used by utils and v8-extras.
 function PromiseCreate(parent) {
   return %promise_internal_constructor(parent);
 }
 
-// Only used by async-await.js
-function RejectPromise(promise, reason, debugEvent) {
-  %PromiseReject(promise, reason, debugEvent);
-}
-
 // Export to bindings
 function DoRejectPromise(promise, reason) {
   %PromiseReject(promise, reason, true);
 }
 
 // Combinators.
 
 // ES#sec-promise.all
 // Promise.all ( iterable )
 function PromiseAll(iterable) {
@@ skipping 113 matching lines @@
 
 // This allows extras to create promises quickly without building extra
 // resolve/reject closures, and allows them to later resolve and reject any
 // promise without having to hold on to those closures forever.
 utils.InstallFunctions(extrasUtils, 0, [
   "createPromise", PromiseCreate,
   "rejectPromise", DoRejectPromise,
   "markPromiseAsHandled", MarkPromiseAsHandled
 ]);
 
-utils.Export(function(to) {
-  to.PromiseCreate = PromiseCreate;
-  to.RejectPromise = RejectPromise;
-});
-
 })