Expose Map/Set methods through the API

src/runtime/runtime-collections.cc

Index: src/runtime/runtime-collections.cc
diff --git a/src/runtime/runtime-collections.cc b/src/runtime/runtime-collections.cc
index 94113fd69fb5457441b611e3410d27b156463c37..1ba1e34356caf5d93e425c7f3b0e6c337b655107 100644
--- a/src/runtime/runtime-collections.cc
+++ b/src/runtime/runtime-collections.cc
@@ -82,13 +82,18 @@ RUNTIME_FUNCTION(Runtime_SetShrink) {
 }
 
 
+void Runtime::JSSetClear(Isolate* isolate, Handle<JSSet> set) {
+  Handle<OrderedHashSet> table(OrderedHashSet::cast(set->table()));
+  table = OrderedHashSet::Clear(table);
+  set->set_table(*table);
+}
+
+
 RUNTIME_FUNCTION(Runtime_SetClear) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSSet, holder, 0);
-  Handle<OrderedHashSet> table(OrderedHashSet::cast(holder->table()));
-  table = OrderedHashSet::Clear(table);
-  holder->set_table(*table);
+  Runtime::JSSetClear(isolate, holder);
   return isolate->heap()->undefined_value();
 }
 
@@ -174,13 +179,18 @@ RUNTIME_FUNCTION(Runtime_MapShrink) {
 }
 
 
+void Runtime::JSMapClear(Isolate* isolate, Handle<JSMap> map) {
+  Handle<OrderedHashMap> table(OrderedHashMap::cast(map->table()));
+  table = OrderedHashMap::Clear(table);
+  map->set_table(*table);
+}
+
+
 RUNTIME_FUNCTION(Runtime_MapClear) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSMap, holder, 0);
-  Handle<OrderedHashMap> table(OrderedHashMap::cast(holder->table()));
-  table = OrderedHashMap::Clear(table);
-  holder->set_table(*table);
+  Runtime::JSMapClear(isolate, holder);
   return isolate->heap()->undefined_value();
 }