chore(facades): missed a couple places in #10620 (#10661)

This lets us skip src/facade/exception* when compiling modules other than core

modules/@angular/compiler/src/output/output_interpreter.ts

@@ -6,8 +6,9 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import {BaseException} from '@angular/core';
+
 import {ListWrapper} from '../facade/collection';
-import {BaseException, unimplemented} from '../facade/exceptions';
 import {isPresent} from '../facade/lang';
 
 import * as o from './output_ast';