Implement symbol @@hasInstance for ES6 instanceof support.

test/mjsunit/es6/hasinstance-symbol.js

Index: test/mjsunit/es6/hasinstance-symbol.js
diff --git a/test/mjsunit/es6/hasinstance-symbol.js b/test/mjsunit/es6/hasinstance-symbol.js
new file mode 100644
index 0000000000000000000000000000000000000000..6783d8deef6c6990916297299c19e5f99fe642df
--- /dev/null
+++ b/test/mjsunit/es6/hasinstance-symbol.js
@@ -0,0 +1,12 @@
+// 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.
+
+// Verify that the hasInstance symbol is installed on function prototype.
+// Test262 makes deeper tests.
+
+(function TestHasInstance() {
+  var a = Array();
+  assertTrue(Array[Symbol.hasInstance](a));
+  assertFalse(Function.prototype[Symbol.hasInstance].call());
+})();