[intl] Fix build for noi18n mode

test/mjsunit/regress/regress-4870.js

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-assertThrows(() => Object.getOwnPropertyDescriptor(Intl.Collator.prototype,
-                                                   'compare')
-                   .get.call(new Intl.DateTimeFormat())('a', 'b'),
-             TypeError)
+if (this.Intl) {
+  assertThrows(() => Object.getOwnPropertyDescriptor(Intl.Collator.prototype,
+                                                     'compare')
+                     .get.call(new Intl.DateTimeFormat())('a', 'b'),
+               TypeError)
+}