[intl] Create the Intl constructors to C++

test/intl/toStringTag.js

+// 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.
+
+let descriptor;
+
+descriptor = Object.getOwnPropertyDescriptor(Intl.DateTimeFormat.prototype, Symbol.toStringTag);

[Yang, 2016/12/21 13:43:39]

80char limit

+
+assertEquals("Object", descriptor.value);
+assertFalse(descriptor.writable);
+assertFalse(descriptor.enumerable);
+assertTrue(descriptor.configurable);
+
+descriptor = Object.getOwnPropertyDescriptor(Intl.NumberFormat.prototype, Symbol.toStringTag);
+
+assertEquals("Object", descriptor.value);
+assertFalse(descriptor.writable);
+assertFalse(descriptor.enumerable);
+assertTrue(descriptor.configurable);
+
+descriptor = Object.getOwnPropertyDescriptor(Intl.Collator.prototype, Symbol.toStringTag);
+
+assertEquals("Object", descriptor.value);
+assertFalse(descriptor.writable);
+assertFalse(descriptor.enumerable);
+assertTrue(descriptor.configurable);