[promises] Port ResolvePromise to TF

test/mjsunit/harmony/async-await-species.js

 // Copyright 2016 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.
 
 // Flags: --harmony-async-await --allow-natives-syntax
 
 function assertEqualsAsync(expected, run, msg) {
   var actual;
   var hadValue = false;
   var hadError = false;
@@ skipping 31 matching lines @@
 }
 
 function getStack(error) {
   var stack = error.stack.split('\n').
     filter(function(line) {
         return /^\s*at @?[a-zA-Z0-9_]/.test(line);
     }).
     map(line => line.replace(/^\s*at (@?[a-zA-Z0-9_\.\[\]]+)(.*)/, "$1"));
 
   // remove `Promise.then()` invocation by assertEqualsAsync()
-  if (stack[2] === "assertEqualsAsync") return [];
+  if (stack[1] === "assertEqualsAsync") return [];
 
   return stack.reverse();
 }
 
 var log = [];
 class FakePromise extends Promise {
   constructor(executor) {
     var stack = getStack(new Error("Getting Callstack"));
     if (stack.length) {
       var first = -1;
@@ skipping 26 matching lines @@
 assertEquals([], log);
 
 log.length = 0;
 assertEqualsAsync(
     "foo",
     test(function testThenOnReturnedPromise() {
       return asyncFn().then(x => (log.push("Then: " + x), x));
     }),
     "should call Promise[@@Species] after non-internal Then");
 assertEquals([
-  "@@Species: [@testThenOnReturnedPromise > Promise.then > FakePromise]",
+  "@@Species: [@testThenOnReturnedPromise > FakePromise]",
   "Then: foo"
 ], log);