[promise] separate PerformPromiseThen from PromiseThen

src/js/prologue.js

 // Copyright 2015 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 169 matching lines @@
   }
 
   // Whitelist of exports from normal natives to experimental natives and debug.
   var expose_list = [
     "AddBoundMethod",
     "ArrayToString",
     "AsyncFunctionNext",
     "AsyncFunctionThrow",
     "GetIterator",
     "GetMethod",
+    "GlobalPromise",
     "IntlParseDate",
     "IntlParseNumber",
     "IsNaN",
+    "IsPromise",
     "MakeError",
     "MakeRangeError",
     "MakeTypeError",
     "MapEntries",
     "MapIterator",
     "MapIteratorNext",
     "MaxSimple",
     "MinSimple",
+    "NewPromiseCapability",
     "NumberIsInteger",
+    "PerformPromiseThen",
     "PromiseChain",
     "PromiseDefer",
     "PromiseAccept",
     "PromiseCreateRejected",
     "PromiseCreateResolved",
     "PromiseThen",
     "RegExpSubclassExecJS",
     "RegExpSubclassMatch",
     "RegExpSubclassReplace",
     "RegExpSubclassSearch",
@@ skipping 144 matching lines @@
 
 extrasUtils.uncurryThis = function uncurryThis(func) {
   return function(thisArg, ...args) {
     return %reflect_apply(func, thisArg, args);
   };
 };
 
 %ToFastProperties(extrasUtils);
 
 })