Revert of [intl] Remove redundant type checking system

test/mjsunit/regress/regress-4962.js

Index: test/mjsunit/regress/regress-4962.js
diff --git a/test/mjsunit/regress/regress-4962.js b/test/mjsunit/regress/regress-4962.js
deleted file mode 100644
index 7b4735c5f8511fad03c6608a9fbeb3507bd30754..0000000000000000000000000000000000000000
--- a/test/mjsunit/regress/regress-4962.js
+++ /dev/null
@@ -1,9 +0,0 @@
-// 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.
-
-assertInstanceof(Intl.NumberFormat.call(new Proxy({},{})), Intl.NumberFormat);
-assertThrows(() =>
-             Intl.DateTimeFormat.prototype.formatToParts.call(
-                 new Proxy({}, {})),
-             TypeError);