diff -r 272dff61a2de -r 77fb0be7d19f src/hotspot/share/oops/oopsHierarchy.hpp
--- a/src/hotspot/share/oops/oopsHierarchy.hpp	Fri Mar 23 12:55:39 2018 +0100
+++ b/src/hotspot/share/oops/oopsHierarchy.hpp	Thu Mar 15 21:24:10 2018 +0100
@@ -192,6 +192,10 @@
   return (T)(CHECK_UNHANDLED_OOPS_ONLY((void*))o);
 }
 
+inline bool check_obj_alignment(oop obj) {
+  return (cast_from_oop<intptr_t>(obj) & MinObjAlignmentInBytesMask) == 0;
+}
+
 // The metadata hierarchy is separate from the oop hierarchy
 
 //      class MetaspaceObj