[modules] Do basic linking.

test/mjsunit/modules-skip-3.js

Index: test/mjsunit/modules-skip-3.js
diff --git a/test/message/for-of-throw-in-body.js b/test/mjsunit/modules-skip-3.js
similarity index 61%
copy from test/message/for-of-throw-in-body.js
copy to test/mjsunit/modules-skip-3.js
index 38b27f38632520e292f66b7ab451df00c2c03b68..38ead4923ad8cc8832ec2a09e3d6cd1818d33506 100644
--- a/test/message/for-of-throw-in-body.js
+++ b/test/mjsunit/modules-skip-3.js
@@ -2,4 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-for (var x of [1, 2, 3]) { throw 42 }
+import {b} from "modules-imports5.js";
+export let a = 22;
+assertSame(undefined, b);
+assertEquals(22, a);