Implement Harmony sets and maps.

src/handles.cc

Index: src/handles.cc
diff --git a/src/handles.cc b/src/handles.cc
index 700a334923a4e739061c0ea95b08575eeee2071d..ec1c7c81ef3a01bbc79c6534bb47df08d2da8645 100644
--- a/src/handles.cc
+++ b/src/handles.cc
@@ -880,6 +880,22 @@ Handle<FixedArray> GetEnumPropertyKeys(Handle<JSObject> object,
 }
 
 
+Handle<ObjectHashSet> ObjectHashSetAdd(Handle<ObjectHashSet> table,
+                                       Handle<Object> key) {
+  CALL_HEAP_FUNCTION(table->GetIsolate(),
+                     table->Add(*key),
+                     ObjectHashSet);
+}
+
+
+Handle<ObjectHashSet> ObjectHashSetRemove(Handle<ObjectHashSet> table,
+                                          Handle<Object> key) {
+  CALL_HEAP_FUNCTION(table->GetIsolate(),
+                     table->Remove(*key),
+                     ObjectHashSet);
+}
+
+
 Handle<ObjectHashTable> PutIntoObjectHashTable(Handle<ObjectHashTable> table,
                                                Handle<JSReceiver> key,
                                                Handle<Object> value) {