[strong] class objects created in strong mode have their prototype frozen

src/ia32/full-codegen-ia32.cc

Index: src/ia32/full-codegen-ia32.cc
diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc
index 1cd3d445945234b2a9abd6dec48d7b848ee4d04c..3e3c82b78a059e1be336c1a5dfe84a703f553422 100644
--- a/src/ia32/full-codegen-ia32.cc
+++ b/src/ia32/full-codegen-ia32.cc
@@ -2564,6 +2564,19 @@ void FullCodeGenerator::EmitClassDefineProperties(ClassLiteral* lit,
 
   // constructor
   __ CallRuntime(Runtime::kToFastProperties, 1);
+
+  if (is_strong(language_mode())) {
+    __ mov(scratch,
+           FieldOperand(eax, JSFunction::kPrototypeOrInitialMapOffset));
+    __ push(eax);
+    __ Push(scratch);
+    // TODO(conradw): It would be more efficient to define the properties with
+    // the right attributes the first time round.
+    // Freeze the prototype.
+    __ CallRuntime(Runtime::kObjectFreeze, 1);
+    // Freeze the constructor.
+    __ CallRuntime(Runtime::kObjectFreeze, 1);
+  }
 }