harmony_scoping: Implement lexical bindings at top level

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 72974a317c18646800178b4c10340a85b444afcf..7ecc039937fca0da8a167d4f40a39612dd5d0732 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -708,6 +708,16 @@ Handle<Context> Factory::NewGlobalContext(Handle<JSFunction> function,
 }
 
 
+Handle<GlobalContextTable> Factory::NewEmptyGlobalContextTable() {
+  Handle<FixedArray> array = NewFixedArray(1);
+  array->set_map_no_write_barrier(*global_context_table_map());
+  array->set(0, Smi::FromInt(0));
+  Handle<GlobalContextTable> context_table =
+      Handle<GlobalContextTable>::cast(array);
+  return context_table;
+}
+
+
 Handle<Context> Factory::NewModuleContext(Handle<ScopeInfo> scope_info) {
   Handle<FixedArray> array =
       NewFixedArray(scope_info->ContextLength(), TENURED);