diff -r 8f849d3ec1e5 -r d376d86b0a01 src/hotspot/share/opto/matcher.cpp
--- a/src/hotspot/share/opto/matcher.cpp	Tue Oct 08 15:30:46 2019 +0200
+++ b/src/hotspot/share/opto/matcher.cpp	Wed Oct 09 12:30:06 2019 +0000
@@ -1751,6 +1751,13 @@
     _shared_nodes.map(leaf->_idx, ex);
   }
 
+  // Have mach nodes inherit GC barrier data
+  if (leaf->is_LoadStore()) {
+    mach->set_barrier_data(leaf->as_LoadStore()->barrier_data());
+  } else if (leaf->is_Mem()) {
+    mach->set_barrier_data(leaf->as_Mem()->barrier_data());
+  }
+
   return ex;
 }