fix(packages): use ES modules for primary build (#11120)

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

@@ -8,8 +8,8 @@
 
 import {Injectable, NgModuleMetadata, Type} from '@angular/core';
 
-import {ReflectorReader, reflector} from '../core_private';
 import {isPresent, stringify} from './facade/lang';
+import {ReflectorReader, reflector} from './private_import_core';
 
 function _isNgModuleMetadata(obj: any): obj is NgModuleMetadata {
   return obj instanceof NgModuleMetadata;