Set Error.stack property writable

test/mjsunit/regress/regress-5245.js

Index: test/mjsunit/regress/regress-5245.js
diff --git a/test/mjsunit/regress/regress-5245.js b/test/mjsunit/regress/regress-5245.js
new file mode 100644
index 0000000000000000000000000000000000000000..9c4f6e7dbd7306a9ab3b73879ee425c3a236c3d1
--- /dev/null
+++ b/test/mjsunit/regress/regress-5245.js
@@ -0,0 +1,24 @@
+// 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.
+
+"use strict";
+
+// After captureStackTrace.
+
+var a = {};
+Error.captureStackTrace(a, Error);
+a.stack = 1;  // Should not throw, stack should be writable.
+
+// After the standard Error constructor.
+
+var b = new Error();
+b.stack = 1;  // Should not throw, stack should be writable.
+b.stack = 1;  // Still writable.
+
+// After read access to stack.
+
+var c = new Error();
+var old_stack = c.stack;
+c.stack = 1;  // Should not throw, stack should be writable.
+c.stack = 1;  // Still writable.