--- old/src/hotspot/cpu/x86/gc/shared/barrierSetAssembler_x86.cpp	2019-03-11 14:24:52.522356173 +0100
+++ new/src/hotspot/cpu/x86/gc/shared/barrierSetAssembler_x86.cpp	2019-03-11 14:24:52.322356176 +0100
@@ -40,6 +40,7 @@
   bool is_not_null = (decorators & IS_NOT_NULL) != 0;
   bool atomic = (decorators & MO_RELAXED) != 0;
 
+  assert(type != T_VALUETYPE, "Not supported yet");
   switch (type) {
   case T_OBJECT:
   case T_ARRAY: {
@@ -105,6 +106,7 @@
   bool is_not_null = (decorators & IS_NOT_NULL) != 0;
   bool atomic = (decorators & MO_RELAXED) != 0;
 
+  assert(type != T_VALUETYPE, "Not supported yet");
   switch (type) {
   case T_OBJECT:
   case T_ARRAY: {