Fix classifier related bug

test/mjsunit/harmony/regress/regress-crbug-621111.js

Index: test/mjsunit/harmony/regress/regress-crbug-621111.js
diff --git a/test/intl/regexp-prepare.js b/test/mjsunit/harmony/regress/regress-crbug-621111.js
similarity index 58%
copy from test/intl/regexp-prepare.js
copy to test/mjsunit/harmony/regress/regress-crbug-621111.js
index dec84110ed02e30bba674538534a069f7d43d39d..58a0d5ce3fc30a11c3b5521ff7ab9a6a8b6fe620 100644
--- a/test/intl/regexp-prepare.js
+++ b/test/mjsunit/harmony/regress/regress-crbug-621111.js
@@ -2,4 +2,5 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-/(\w)(\w)(\w)(\w)(\w)(\w)(\w)(\w)(\w)(\w)/.exec(">>>abcdefghij<<<");
+(y = 1[1, [...[]]]) => 1;   // will core dump, if not fixed
+(y = 1[1, [...[]]]) => {};  // will core dump, if not fixed