Throw when attaching a stack trace to an object fails.

test/mjsunit/regress/regress-crbug-478011.js

Index: test/mjsunit/regress/regress-crbug-478011.js
diff --git a/test/message/export-duplicate-as.js b/test/mjsunit/regress/regress-crbug-478011.js
similarity index 63%
copy from test/message/export-duplicate-as.js
copy to test/mjsunit/regress/regress-crbug-478011.js
index 49b52d4b17177e9443445f00379227cce07a034d..fcc05280407ba32f9e1ddf75d065fdcfecf48f6a 100644
--- a/test/message/export-duplicate-as.js
+++ b/test/mjsunit/regress/regress-crbug-478011.js
@@ -1,9 +1,7 @@
 // Copyright 2015 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.
-//
-// MODULE
 
-var a, b;
-export { a as c };
-export { a, b as c };
+var e = {};
+Object.preventExtensions(e);
+assertThrows(function() { Error.captureStackTrace(e) });