feat(@angular/cli): load reflect only on dev

`reflect-metadata` is not needed in AOT builds.

Author: filipesilva

packages/@angular/cli/blueprints/ng/files/__path__/environments/environment.ts

@@ -3,6 +3,11 @@
 // `ng build --env=prod` then `environment.prod.ts` will be used instead.
 // The list of which env maps to which file can be found in `.angular-cli.json`.
 
+// Evergreen browsers require these polyfills on non-aot builds.
+// If you need to use `--prod --no-aot` you should transfer these over to `polyfills.ts`.
+import 'core-js/es6/reflect';
+import 'core-js/es7/reflect';
+
 export const environment = {
   production: false
 };

packages/@angular/cli/blueprints/ng/files/__path__/polyfills.ts

@@ -40,11 +40,6 @@
 // import 'web-animations-js';  // Run `npm install --save web-animations-js`.
 
 
-/** Evergreen browsers require these. **/
-import 'core-js/es6/reflect';
-import 'core-js/es7/reflect';
-
-
 /** ALL Firefox browsers require the following to support `@angular/animation`. **/
 // import 'web-animations-js';  // Run `npm install --save web-animations-js`.
 
@@ -70,3 +65,6 @@ import 'zone.js/dist/zone';  // Included with Angular CLI.
  * Need to import at least one locale-data with intl.
  */
 // import 'intl/locale-data/jsonp/en';
+
+// Each environment can have different polyfills as well.
+import './environments/environment';