diff -r 657924d1e2ba -r e709712a8188 src/hotspot/share/gc/z/c2/zBarrierSetC2.cpp
--- a/src/hotspot/share/gc/z/c2/zBarrierSetC2.cpp	Wed Jul 03 14:33:40 2019 +0000
+++ b/src/hotspot/share/gc/z/c2/zBarrierSetC2.cpp	Wed Jul 03 07:56:41 2019 -0700
@@ -545,8 +545,8 @@
   Node* then = igvn.transform(new IfTrueNode(iff));
   Node* elsen = igvn.transform(new IfFalseNode(iff));
 
-  Node* new_loadp = igvn.transform(new LoadBarrierSlowRegNode(then, in_mem, in_adr, in_val->adr_type(),
-                                                                    (const TypePtr*) in_val->bottom_type(), MemNode::unordered, barrier->is_weak()));
+  Node* new_loadp = igvn.transform(new LoadBarrierSlowRegNode(then, in_adr, in_val,
+                                                              (const TypePtr*) in_val->bottom_type(), barrier->is_weak()));
 
   // Create the final region/phi pair to converge cntl/data paths to downstream code
   Node* result_region = igvn.transform(new RegionNode(3));
@@ -672,7 +672,6 @@
     case Op_ZCompareAndExchangeP:
     case Op_ZCompareAndSwapP:
     case Op_ZWeakCompareAndSwapP:
-    case Op_LoadBarrierSlowReg:
 #ifdef ASSERT
       if (VerifyOptoOopOffsets) {
         MemNode *mem = n->as_Mem();