Add explicit require util/defines as ASSUME_ES6 is referenced.

PiperOrigin-RevId: 706918380

Author: concavelenz

src/com/google/javascript/jscomp/js/es6/util/iteratorfromarray.js

@@ -16,8 +16,10 @@
 
 /**
  * @fileoverview Utilities for iterator-returning methods.
+ * @suppress {uselessCode} for the require lines below.
  */
 'require es6/symbol';
+'require util/defines';
 
 
 /**