--- old/src/hotspot/share/c1/c1_Instruction.hpp	2019-01-15 22:00:22.241054849 -0800
+++ new/src/hotspot/share/c1/c1_Instruction.hpp	2019-01-15 22:00:22.057048084 -0800
@@ -1574,14 +1574,19 @@
 
 
 LEAF(MonitorEnter, AccessMonitor)
+bool _maybe_valuetype;
  public:
   // creation
-  MonitorEnter(Value obj, int monitor_no, ValueStack* state_before)
+  MonitorEnter(Value obj, int monitor_no, ValueStack* state_before, bool maybe_valuetype)
   : AccessMonitor(obj, monitor_no, state_before)
+  , _maybe_valuetype(maybe_valuetype)
   {
     ASSERT_VALUES
   }
 
+  // accessors
+  bool maybe_valuetype() const                   { return _maybe_valuetype; }
+
   // generic
   virtual bool can_trap() const                  { return true; }
 };