[es6] Ensure that for-in/of loops have a proper TDZ for their boundnames

test/mjsunit/es6/debug-stepnext-for.js

Index: test/mjsunit/es6/debug-stepnext-for.js
diff --git a/test/mjsunit/es6/debug-stepnext-for.js b/test/mjsunit/es6/debug-stepnext-for.js
index 79cb3781a79a697b8f8305ceb8967b8d35008bfc..83a9fc3f2226ab8277b1269f942b62120c8eb1e4 100644
--- a/test/mjsunit/es6/debug-stepnext-for.js
+++ b/test/mjsunit/es6/debug-stepnext-for.js
@@ -110,7 +110,7 @@ var expected = [
   // Exit.
   "y0","z0",
 ]
-print("expected:\n"+ JSON.stringify(log));
+print("expected:\n"+ JSON.stringify(expected));
 
 assertArrayEquals(expected, log);
 assertEquals(48, s);