Address some comments for class flags

Change-Id: I354f48aefc37ce92c4d02cfce1723db0e28907bf
diff --git a/runtime/mirror/class.cc b/runtime/mirror/class.cc
index 3bea978..ad26824 100644
--- a/runtime/mirror/class.cc
+++ b/runtime/mirror/class.cc
@@ -44,7 +44,7 @@
       << java_lang_Class_.Read()
       << " " << java_lang_Class;
   CHECK(java_lang_Class != nullptr);
-  java_lang_Class->SetClassFlags(java_lang_Class->GetClassFlags() | mirror::kClassFlagClass);
+  java_lang_Class->SetClassFlags(mirror::kClassFlagClass);
   java_lang_Class_ = GcRoot<Class>(java_lang_Class);
 }