[strong] dot prototypes of strong class literals should be strong objects

test/mjsunit/strong/literals.js

Index: test/mjsunit/strong/literals.js
diff --git a/test/mjsunit/strong/literals.js b/test/mjsunit/strong/literals.js
index 73129e7a09072197df16ec1d88ac76ccfab1597d..8c04d6e35a7f7ed2fd48a30052d92b5e145cf96a 100644
--- a/test/mjsunit/strong/literals.js
+++ b/test/mjsunit/strong/literals.js
@@ -310,8 +310,8 @@ let GeneratorPrototype = (function*(){}).__proto__;
   'use strong';
   function assertStrongClass(x) {
     assertTrue(%IsStrong(x));
-    // TODO(rossberg): strongify class prototype and instance
-    // assertTrue(%IsStrong(x.prototype));
+    assertTrue(%IsStrong(x.prototype));
+    // TODO(rossberg): strongify class instance
     // assertTrue(%IsStrong(new x));
   }
   class C {};