Ensure CreateDataProperty works correctly on TypedArrays

test/mjsunit/regress/regress-crbug-596394.js

Index: test/mjsunit/regress/regress-crbug-596394.js
diff --git a/test/mjsunit/regress/regress-crbug-596394.js b/test/mjsunit/regress/regress-crbug-596394.js
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+// 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.
+
+// In ES#sec-array.prototype.concat
+// When concat makes a new integer-indexed exotic object, the resulting properties

[adamk, 2016/03/21 21:44:01]

Nit: please wrap to 80 cols.

+// are non-configurable and cannot have CreateDataPropertyOrThrow called on them,
+// so it throws a TypeError on failure to make a new property.
+
+__v_0 = new Uint8Array(100);
+array = new Array(10);
+array.__proto__ = __v_0;
+assertThrows(() => Array.prototype.concat.call(array), TypeError);