[es6] Fix the %TypedArray% constructor.

test/mjsunit/regress/regress-5763-2.js

Index: test/mjsunit/regress/regress-5763-2.js
diff --git a/test/mjsunit/regress/regress-5763-2.js b/test/mjsunit/regress/regress-5763-2.js
new file mode 100644
index 0000000000000000000000000000000000000000..0964b7f8e674d9b6a7c494bcdbc6bd6ee6494c7f
--- /dev/null
+++ b/test/mjsunit/regress/regress-5763-2.js
@@ -0,0 +1,11 @@
+// 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.
+
+// Flags: --allow-natives-syntax
+
+try {
+  var TA = Object.getPrototypeOf(Int8Array);
+  var obj = Reflect.construct(TA, [], Int8Array);
+  new Int8Array(4).set(obj);
+} catch (e) {}