Starting using GlobalDictionary for global objects instead of NameDictionary.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index fcca1548443ca809bb8685efcebcf77039497e60..dcb92b25cc1ab27a6d68fd7c8550ad716cd6431e 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -2859,6 +2859,30 @@ void Genesis::TransferNamedProperties(Handle<JSObject> from,
         }
       }
     }
+  } else if (from->IsGlobalObject()) {
+    Handle<GlobalDictionary> properties =
+        Handle<GlobalDictionary>(from->global_dictionary());
+    int capacity = properties->Capacity();
+    for (int i = 0; i < capacity; i++) {
+      Object* raw_key(properties->KeyAt(i));
+      if (properties->IsKey(raw_key)) {
+        DCHECK(raw_key->IsName());
+        // If the property is already there we skip it.
+        Handle<Name> key(Name::cast(raw_key));
+        LookupIterator it(to, key, LookupIterator::OWN_SKIP_INTERCEPTOR);
+        CHECK_NE(LookupIterator::ACCESS_CHECK, it.state());
+        if (it.IsFound()) continue;
+        // Set the property.
+        Handle<Object> value =
+            Handle<Object>(properties->ValueAt(i), isolate());
+        DCHECK(value->IsPropertyCell());
+        value = handle(PropertyCell::cast(*value)->value(), isolate());
+        if (value->IsTheHole()) continue;
+        PropertyDetails details = properties->DetailsAt(i);
+        DCHECK_EQ(kData, details.kind());
+        JSObject::AddProperty(to, key, value, details.attributes());
+      }
+    }
   } else {
     Handle<NameDictionary> properties =
         Handle<NameDictionary>(from->property_dictionary());
@@ -2876,10 +2900,7 @@ void Genesis::TransferNamedProperties(Handle<JSObject> from,
         Handle<Object> value = Handle<Object>(properties->ValueAt(i),
                                               isolate());
         DCHECK(!value->IsCell());
-        if (value->IsPropertyCell()) {
-          value = handle(PropertyCell::cast(*value)->value(), isolate());
-        }
-        if (value->IsTheHole()) continue;
+        DCHECK(!value->IsTheHole());
         PropertyDetails details = properties->DetailsAt(i);
         DCHECK_EQ(kData, details.kind());
         JSObject::AddProperty(to, key, value, details.attributes());