Port some GC fixes from the bleeding edge to the 2.3 branch. These are:...

src/objects.cc

Index: src/objects.cc
===================================================================
--- src/objects.cc	(revision 5701)
+++ src/objects.cc	(working copy)
@@ -6320,7 +6320,7 @@
         // When we set the is_extensible flag to false we always force
         // the element into dictionary mode (and force them to stay there).
         if (!map()->is_extensible()) {
-          Handle<Object> number(Heap::NumberFromUint32(index));
+          Handle<Object> number(Factory::NewNumberFromUint(index));
           Handle<String> index_string(Factory::NumberToString(number));
           Handle<Object> args[1] = { index_string };
           return Top::Throw(*Factory::NewTypeError("object_not_extensible",
@@ -8434,7 +8434,9 @@
   details = PropertyDetails(details.attributes(),
                             details.type(),
                             DetailsAt(entry).index());
-  SetEntry(entry, NumberDictionaryShape::AsObject(key), value, details);
+  Object* object_key = NumberDictionaryShape::AsObject(key);
+  if (object_key->IsFailure()) return object_key;
+  SetEntry(entry, object_key, value, details);
   return this;
 }