Error stack getter should not overwrite itself with a data property.

test/mjsunit/regress/regress-3294.js

Index: test/mjsunit/regress/regress-3294.js
diff --git a/test/mjsunit/regress/regress-358090.js b/test/mjsunit/regress/regress-3294.js
similarity index 62%
copy from test/mjsunit/regress/regress-358090.js
copy to test/mjsunit/regress/regress-3294.js
index d9c07e857dd531c5b32460ee71cdf2ec87da910c..400e6b688600cab8a1b9401bac2659d47e8b3833 100644
--- a/test/mjsunit/regress/regress-358090.js
+++ b/test/mjsunit/regress/regress-3294.js
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-var x = Array(100000);
-y =  Array.apply(Array, x);
-y.unshift(4);
-y.shift();
+var e = new Error('message');
+var keys = Object.keys(e);
+e.stack;
+assertEquals(keys, Object.keys(e));