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

src/arm/full-codegen-arm.cc

Index: src/arm/full-codegen-arm.cc
diff --git a/src/arm/full-codegen-arm.cc b/src/arm/full-codegen-arm.cc
index 476bd05e7395afa602c8b0e5b179ec7b0443b0b8..5c34ba744d10d34329d79fd3fd0871e4172d75d7 100644
--- a/src/arm/full-codegen-arm.cc
+++ b/src/arm/full-codegen-arm.cc
@@ -2658,6 +2658,19 @@ void FullCodeGenerator::EmitClassDefineProperties(ClassLiteral* lit,
 
   // constructor
   __ CallRuntime(Runtime::kToFastProperties, 1);
+
+  if (is_strong(language_mode())) {
+    __ ldr(scratch,
+           FieldMemOperand(r0, JSFunction::kPrototypeOrInitialMapOffset));
+    __ push(r0);
+    __ 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);
+  }
 }