Change recursive error printing to just replace recursively

test/mjsunit/cyclic-error-to-string.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 18 matching lines @@
 // compatibility with Safari and Firefox.
 
 var e = new Error();
 assertEquals('Error', e + '');
 
 e = new Error();
 e.name = e;
 e.message = e;
 e.stack = e;
 e.arguments = e;
-assertEquals('', e + '');
+assertEquals(': ', e + '');
 
 e = new Error();
 e.name = [ e ];
 e.message = [ e ];
 e.stack = [ e ];
 e.arguments = [ e ];
-assertEquals('', e + '');
+assertEquals(': ', e + '');