Avoid calling the builtin String.prototype.split in Intl

test/intl/regress-5179.js

Index: test/intl/regress-5179.js
diff --git a/test/intl/regress-5179.js b/test/intl/regress-5179.js
new file mode 100644
index 0000000000000000000000000000000000000000..c9132c0e993c0b9a1f99b183738c56833f76a82e
--- /dev/null
+++ b/test/intl/regress-5179.js
@@ -0,0 +1,15 @@
+// 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.
+
+Object.defineProperty(String.prototype, Symbol.split, {
+    get() {
+        return function(obj, limit) {
+            return [, null];
+        }
+    }
+});
+
+dtf = new Intl.DateTimeFormat("de", {timeZone:"America/bueNos_airES"});
+
+assertEquals("America/Buenos_Aires", dtf.resolvedOptions().timeZone);