[modules] Add tests for the name property of default-exported functions.

test/mjsunit/modules-skip-default-name1.js

Index: test/mjsunit/modules-skip-default-name1.js
diff --git a/test/message/unicode-escape-undefined.js b/test/mjsunit/modules-skip-default-name1.js
similarity index 83%
copy from test/message/unicode-escape-undefined.js
copy to test/mjsunit/modules-skip-default-name1.js
index 49de2fb2c814c14ed440a358b3d22c5dd41b982c..30a95cd691dae46494f34a2e376246d57300b72a 100644
--- a/test/message/unicode-escape-undefined.js
+++ b/test/mjsunit/modules-skip-default-name1.js
@@ -2,4 +2,4 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-print("\u{110000}");
+export default function gaga() {}