[esnext] prototype runtime implementation for async functions

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 165 matching lines @@
   %CheckIsBootstrapping();
 
   for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
     imports(exports_container);
   }
 
   // Whitelist of exports from normal natives to experimental natives and debug.
   var expose_list = [
     "AddBoundMethod",
     "ArrayToString",
+    "AsyncFunctionNext",
+    "AsyncFunctionThrow",
     "ErrorToString",
     "GetIterator",
     "GetMethod",
     "IntlParseDate",
     "IntlParseNumber",
     "IsNaN",
     "MakeError",
     "MakeRangeError",
     "MakeTypeError",
     "MapEntries",
     "MapIterator",
     "MapIteratorNext",
     "MaxSimple",
     "MinSimple",
     "NumberIsInteger",
     "PromiseChain",
     "PromiseDefer",
     "PromiseAccept",
+    "PromiseCreateRejected",
+    "PromiseCreateResolved",
+    "PromiseThen",
     "RegExpSubclassExecJS",
     "RegExpSubclassMatch",
     "RegExpSubclassReplace",
     "RegExpSubclassSearch",
     "RegExpSubclassSplit",
     "RegExpSubclassTest",
     "SetIterator",
     "SetIteratorNext",
     "SetValues",
     "SymbolToString",
@@ skipping 145 matching lines @@
 
 extrasUtils.uncurryThis = function uncurryThis(func) {
   return function(thisArg, ...args) {
     return %reflect_apply(func, thisArg, args);
   };
 };
 
 %ToFastProperties(extrasUtils);
 
 })