Fix stack trace accessor behavior.

test/mjsunit/regress/regress-3404.js

+// Copyright 2014 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.
+
+function testError(error) {
+  // Reconfigure e.stack to be non-configurable
+  var desc1 = Object.getOwnPropertyDescriptor(error, "stack");
+  Object.defineProperty(error, "stack",
+                        {get: desc1.get, set: desc1.set, configurable: false});
+
+  var desc2 = Object.getOwnPropertyDescriptor(error, "stack");
+  assertFalse(desc2.configurable);
+  assertEquals(desc1.get, desc2.get);
+  assertEquals(desc2.get, desc2.get);
+}
+
+function stackOverflow() {
+  function f() { f(); }
+  try { f() } catch (e) { return e; }
+}
+
+function referenceError() {
+  try { g() } catch (e) { return e; }
+}
+
+testError(referenceError());
+testError(stackOverflow());