--- old/src/hotspot/share/oops/oop.hpp	2018-05-21 11:52:11.232047838 +0200
+++ new/src/hotspot/share/oops/oop.hpp	2018-05-21 11:52:10.924042351 +0200
@@ -81,6 +81,9 @@
   inline Klass** klass_addr();
   inline narrowKlass* compressed_klass_addr();
 
+  // oop only test (does not load klass)
+  inline bool klass_is_value_type();
+
   inline void set_klass(Klass* k);
   inline void release_set_klass(Klass* k);