fix(SyncAsyncResult): fix default async value (#10013)

modules/@angular/compiler/src/util.ts

@@ -93,7 +93,7 @@ export function createDiTokenExpression(token: CompileTokenMetadata): o.Expressi
 export class SyncAsyncResult<T> {
   constructor(public syncResult: T, public asyncResult: Promise<T> = null) {
     if (!asyncResult) {
-      asyncResult = Promise.resolve(syncResult);
+      this.asyncResult = Promise.resolve(syncResult);
     }
   }
 }

modules/@angular/compiler/test/util_spec.ts

@@ -0,0 +1,24 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {fakeAsync, flushMicrotasks} from '@angular/core/testing/fake_async';
+import {beforeEach, beforeEachProviders, ddescribe, describe, expect, iit, inject, it, xit} from '@angular/core/testing/testing_internal';
+
+import {SyncAsyncResult} from '../src/util';
+
+export function main() {
+  describe('util', () => {
+    describe('SyncAsyncResult', () => {
+      it('async value should default to Promise.resolve(syncValue)', fakeAsync(() => {
+           const syncValue = {};
+           const sar = new SyncAsyncResult(syncValue);
+           sar.asyncResult.then((v: any) => expect(v).toBe(syncValue));
+         }));
+    });
+  })
+}