Make stack property collected by captureStackTrace non-enumerable and -writable.

test/mjsunit/stack-traces.js

Index: test/mjsunit/stack-traces.js
diff --git a/test/mjsunit/stack-traces.js b/test/mjsunit/stack-traces.js
index a30a51548dfc40dbf8207501904f1eb6ef2daef5..914f1ba188d4b6a2da6a51ad43a2c77f556ea2b1 100644
--- a/test/mjsunit/stack-traces.js
+++ b/test/mjsunit/stack-traces.js
@@ -381,6 +381,15 @@ assertEquals(undefined, error.stack);
 error = new Error();
 Error.captureStackTrace(error);
 
+// Check property descriptor.
+var o = {};
+Error.captureStackTrace(o);
+assertEquals([], Object.keys(o));
+var desc = Object.getOwnPropertyDescriptor(o, "stack");
+assertFalse(desc.writable);
+assertFalse(desc.enumerable);
+assertTrue(desc.configurable);
+
 // Check that exceptions thrown within prepareStackTrace throws an exception.
 Error.prepareStackTrace = function(e, frames) { throw 42; }