[modules] Do basic linking.

test/mjsunit/modules-skip-1.js

Index: test/mjsunit/modules-skip-1.js
diff --git a/test/message/for-of-throw-in-body.js b/test/mjsunit/modules-skip-1.js
similarity index 56%
copy from test/message/for-of-throw-in-body.js
copy to test/mjsunit/modules-skip-1.js
index 38b27f38632520e292f66b7ab451df00c2c03b68..35731806bb60d6c305d0cfdc14e6a75bb575adc1 100644
--- a/test/message/for-of-throw-in-body.js
+++ b/test/mjsunit/modules-skip-1.js
@@ -2,4 +2,8 @@
 // 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 }
+export default 42;
+export let a = 1;
+export {a as b};
+export function set_a(x) { a = x };
+export function get_a() { return a };