[strong] class objects created in strong mode are frozen

src/full-codegen.cc

Index: src/full-codegen.cc
diff --git a/src/full-codegen.cc b/src/full-codegen.cc
index 636698122617ee491f72ea7862c2bc08547d4c36..a97ea22134af4e9ea52765b1471b51d74921e791 100644
--- a/src/full-codegen.cc
+++ b/src/full-codegen.cc
@@ -1204,6 +1204,13 @@ void FullCodeGenerator::VisitClassLiteral(ClassLiteral* lit) {
     // Verify that compilation exactly consumed the number of store ic slots
     // that the ClassLiteral node had to offer.
     DCHECK(!FLAG_vector_stores || store_slot_index == lit->slot_count());
+
+    if (is_strong(language_mode())) {
+      // TODO(conradw): It would be more efficient to define the properties with
+      // the right attributes the first time round.
+      __ Push(result_register());
+      __ CallRuntime(Runtime::kObjectFreeze, 1);
+    }
   }
 
   context()->Plug(result_register());