--- old/src/hotspot/cpu/x86/gc/z/zBarrierSetAssembler_x86.cpp	2019-03-11 14:24:52.926356168 +0100
+++ new/src/hotspot/cpu/x86/gc/z/zBarrierSetAssembler_x86.cpp	2019-03-11 14:24:52.726356171 +0100
@@ -197,6 +197,7 @@
                                     Register tmp2) {
   BLOCK_COMMENT("ZBarrierSetAssembler::store_at {");
 
+  assert(type != T_VALUETYPE, "Not supported yet");
   // Verify oop store
   if (type == T_OBJECT || type == T_ARRAY) {
     // Note that src could be noreg, which means we