feat(@angular-devkit/build-angular): ensure required JIT polyfills

Author: clydin

packages/angular_devkit/build_angular/src/angular-cli-files/models/jit-polyfills.js

@@ -0,0 +1,8 @@
+/**
+ * @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 'core-js/es7/reflect';

packages/angular_devkit/build_angular/src/angular-cli-files/models/webpack-configs/common.ts

@@ -62,6 +62,13 @@ export function getCommonConfig(wco: WebpackConfigOptions) {
     entryPoints['polyfills'] = [path.resolve(root, buildOptions.polyfills)];
   }
 
+  if (!buildOptions.aot) {
+    entryPoints['polyfills'] = [
+      ...(entryPoints['polyfills'] || []),
+      path.join(__dirname, '..', 'jit-polyfills.js'),
+    ];
+  }
+
   // determine hashing format
   const hashFormat = getOutputHashFormat(buildOptions.outputHashing as any);