src/share/vm/opto/matcher.cpp

*** 2154,2163 ****
--- 2154,2168 ----
          break;
        case Op_ClearArray:
        case Op_SafePoint:
          mem_op = true;
          break;
+       case Op_ShenandoahReadBarrier:
+       case Op_ShenandoahWriteBarrier:
+         mem_op = true;
+         set_shared(n);
+         break;
        default:
          if( n->is_Store() ) {
            // Do match stores, despite no ideal reg
            mem_op = true;
            break;