Revert of [intl] Remove redundant type checking system

test/intl/bad-target.js

Index: test/intl/bad-target.js
diff --git a/test/intl/bad-target.js b/test/intl/bad-target.js
deleted file mode 100644
index 7b7cbe9b5dd24268fadaa509af78cc1cc935b7e1..0000000000000000000000000000000000000000
--- a/test/intl/bad-target.js
+++ /dev/null
@@ -1,39 +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.
-
-// Calling Intl methods with a bad receiver throws a TypeError
-
-// An uninitialized object of the same type
-assertThrows(() => Object.create(Intl.DateTimeFormat.prototype).format(),
-             TypeError);
-assertThrows(() => Object.create(Intl.NumberFormat.prototype).format(),
-             TypeError);
-assertThrows(() => Object.create(Intl.Collator.prototype).compare(),
-             TypeError);
-assertThrows(() => Object.create(Intl.v8BreakIterator.prototype).adoptText(),
-             TypeError);
-assertThrows(() => Object.create(Intl.v8BreakIterator.prototype).first(),
-             TypeError);
-assertThrows(() => Object.create(Intl.v8BreakIterator.prototype).next(),
-             TypeError);
-assertThrows(() => Object.create(Intl.v8BreakIterator.prototype).current(),
-             TypeError);
-assertThrows(() => Object.create(Intl.v8BreakIterator.prototype).breakType(),
-             TypeError);
-
-// Or similarly, just accessing the method getter on the prototype
-assertThrows(() => Intl.DateTimeFormat.prototype.format, TypeError);
-assertThrows(() => Intl.NumberFormat.prototype.format, TypeError);
-assertThrows(() => Intl.Collator.prototype.compare, TypeError);
-assertThrows(() => Intl.v8BreakIterator.prototype.adoptText, TypeError);
-assertThrows(() => Intl.v8BreakIterator.prototype.first, TypeError);
-assertThrows(() => Intl.v8BreakIterator.prototype.next, TypeError);
-assertThrows(() => Intl.v8BreakIterator.prototype.current, TypeError);
-assertThrows(() => Intl.v8BreakIterator.prototype.breakType, TypeError);
-
-// The method .call'd on a different instance will have that
-// other instance benignly ignored, since it's a bound function
-let nf = Intl.NumberFormat();
-let df = Intl.DateTimeFormat();
-assertEquals("0", nf.format.call(df, 0));