Starting using GlobalDictionary for global objects instead of NameDictionary.

src/runtime/runtime-object.cc

Index: src/runtime/runtime-object.cc
diff --git a/src/runtime/runtime-object.cc b/src/runtime/runtime-object.cc
index b470c9670516ee02e5d38042c263bbf0c3efebb1..4ab2d4caa6ad99e0c0c34ee3773a517df480129e 100644
--- a/src/runtime/runtime-object.cc
+++ b/src/runtime/runtime-object.cc
@@ -598,19 +598,27 @@ RUNTIME_FUNCTION(Runtime_KeyedGetProperty) {
       DisallowHeapAllocation no_allocation;
       Handle<JSObject> receiver = Handle<JSObject>::cast(receiver_obj);
       Handle<Name> key = Handle<Name>::cast(key_obj);
-      if (!receiver->HasFastProperties()) {
+      if (receiver->IsGlobalObject()) {
         // Attempt dictionary lookup.
-        NameDictionary* dictionary = receiver->property_dictionary();
+        GlobalDictionary* dictionary = receiver->global_dictionary();
         int entry = dictionary->FindEntry(key);
-        if ((entry != NameDictionary::kNotFound) &&
+        if ((entry != GlobalDictionary::kNotFound) &&
             (dictionary->DetailsAt(entry).type() == DATA)) {
           Object* value = dictionary->ValueAt(entry);
-          if (!receiver->IsGlobalObject()) return value;
           DCHECK(value->IsPropertyCell());
           value = PropertyCell::cast(value)->value();
           if (!value->IsTheHole()) return value;
           // If value is the hole (meaning, absent) do the general lookup.
         }
+      } else if (!receiver->HasFastProperties()) {
+        // Attempt dictionary lookup.
+        NameDictionary* dictionary = receiver->property_dictionary();
+        int entry = dictionary->FindEntry(key);
+        if ((entry != NameDictionary::kNotFound) &&
+            (dictionary->DetailsAt(entry).type() == DATA)) {
+          Object* value = dictionary->ValueAt(entry);
+          return value;
+        }
       }
     } else if (key_obj->IsSmi()) {
       // JSObject without a name key. If the key is a Smi, check for a