Fix bug in __proto__ assignment transition cache where we forget the next...

Fix bug in __proto__ assignment transition cache where we forget the next enumeration index resulting in wrong iteration order.
Review URL: https://chromiumcodereview.appspot.com/10515006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11706 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects.cc

@@ -6040,6 +6040,7 @@ MaybeObject* DescriptorArray::RemoveTransitions() {
     }
   }
   ASSERT(next_descriptor == new_descriptors->number_of_descriptors());
+  new_descriptors->SetNextEnumerationIndex(NextEnumerationIndex());
 
   return new_descriptors;
 }

test/mjsunit/regress/regress-iteration-order.js

+// Copyright 2012 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+var x = {a: 1, b: 2, c: 3};
+
+x.__proto__ = {};
+
+delete x.b;
+
+x.d = 4;
+
+s = "";
+
+for (key in x) {
+    s += x[key];
+}
+
+assertEquals("134", s);