Reintroduced dictionary that can use objects as keys.

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index ac96668d995b396bcc997f90a601e6e7d99c16f0..05dd5c96619ea25d61feb38d8f54a9834b61f7e7 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -84,6 +84,14 @@ Handle<NumberDictionary> Factory::NewNumberDictionary(int at_least_space_for) {
 }
 
 
+Handle<ObjectHashTable> Factory::NewObjectHashTable(int at_least_space_for) {
+  ASSERT(0 <= at_least_space_for);
+  CALL_HEAP_FUNCTION(isolate(),
+                     ObjectHashTable::Allocate(at_least_space_for),
+                     ObjectHashTable);
+}
+
+
 Handle<DescriptorArray> Factory::NewDescriptorArray(int number_of_descriptors) {
   ASSERT(0 <= number_of_descriptors);
   CALL_HEAP_FUNCTION(isolate(),