fix(compiler): allow decorators defined in the same file

modules/@angular/compiler_cli/integrationtest/src/a/multiple_components.ts

@@ -19,3 +19,9 @@ export function NotADirective(c: any): void {}
 @NotADirective
 export class HasCustomDecorator {
 }
+
+// Verify that custom decorators have metadata collected, eg Ionic
+export function Page(c: any): (f: Function) => void {return c;}
+
+@Page({template: 'Ionic template'})
+export class AnIonicPage {}