[parser] report illegal token error in ParseMemberExpressionContinuation()

test/message/regress/regress-4829-1.js

Index: test/message/regress/regress-4829-1.js
diff --git a/test/message/arrow-invalid-rest.js b/test/message/regress/regress-4829-1.js
similarity index 77%
copy from test/message/arrow-invalid-rest.js
copy to test/message/regress/regress-4829-1.js
index 870dbe9f542ea95050514227feaf9b2299ca516d..1ad5feda8cb96cd24e4c47f7407c9699d150c327 100644
--- a/test/message/arrow-invalid-rest.js
+++ b/test/message/regress/regress-4829-1.js
@@ -1,8 +1,7 @@
 // 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 = (...x = 10) => x;
-f(1, 2, 3, 4, 5);
+function tag() {}
+
+tag(tag`\xyy`);