Fix spread array inside array literal

test/mjsunit/harmony/regress/regress-4298.js

Index: test/mjsunit/harmony/regress/regress-4298.js
diff --git a/test/message/arrow-bare-rest-param.js b/test/mjsunit/harmony/regress/regress-4298.js
similarity index 65%
copy from test/message/arrow-bare-rest-param.js
copy to test/mjsunit/harmony/regress/regress-4298.js
index 9b3916d95952e7eb3f5cd61d02f634a994071c43..98e69d1acf0ea4eb925f75c95c3b3b5fcc0854bf 100644
--- a/test/message/arrow-bare-rest-param.js
+++ b/test/mjsunit/harmony/regress/regress-4298.js
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
-// Flags: --harmony-rest-parameters --harmony-arrow-functions
+// Flags: --harmony-spread-arrays
 
-...x => 10
+var arr = [1, 2, ...[3]];
+assertEquals([1, 2, 3], arr);