Fix issue with Map/SetIterator and types

BUG=v8:3281
LOG=N
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/246993003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20893 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/types.cc

@@ -226,6 +226,8 @@ int TypeImpl<Config>::BitsetType::Lub(i::Map* map) {
     case JS_DATA_VIEW_TYPE:
     case JS_SET_TYPE:
     case JS_MAP_TYPE:
+    case JS_SET_ITERATOR_TYPE:
+    case JS_MAP_ITERATOR_TYPE:
     case JS_WEAK_MAP_TYPE:
     case JS_WEAK_SET_TYPE:
       if (map->is_undetectable()) return kUndetectable;

test/mjsunit/regress/regress-3281.js

+// Copyright 2014 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.
+
+// Flags: --allow-natives-syntax --harmony-collections
+
+// Should not crash or raise an exception.
+
+var s = new Set();
+var setIterator = %SetCreateIterator(s, 2);
+
+var m = new Map();
+var mapIterator = %MapCreateIterator(m, 2);