Declare the arguments object before creating the function var, to make sure it masks it

test/mjsunit/regress/regress-649067.js

Index: test/mjsunit/regress/regress-649067.js
diff --git a/test/message/arrow-invalid-rest-2.js b/test/mjsunit/regress/regress-649067.js
similarity index 68%
copy from test/message/arrow-invalid-rest-2.js
copy to test/mjsunit/regress/regress-649067.js
index 3517803d30256b09e78a1aa1f43817e733dc060e..cd75004230ad4b0ce5c69d521090f54e64db3db0 100644
--- a/test/message/arrow-invalid-rest-2.js
+++ b/test/mjsunit/regress/regress-649067.js
@@ -1,8 +1,5 @@
 // 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.
-//
-//
 
-var f = (a, ...x = 10) => x;
-f(1, 2, 3, 4, 5);
+assertEquals(1, (function arguments() { return eval("arguments"); })(1)[0]);