--- old/src/hotspot/share/gc/g1/heapRegion.hpp	2019-09-30 17:13:11.812029376 -0700
+++ new/src/hotspot/share/gc/g1/heapRegion.hpp	2019-09-30 17:13:11.432029389 -0700
@@ -291,6 +291,8 @@
   // for the collection set.
   double _predicted_elapsed_time_ms;
 
+  uint _node_index;
+
   // Iterate over the references covered by the given MemRegion in a humongous
   // object and apply the given closure to them.
   // Humongous objects are allocated directly in the old-gen. So we need special
@@ -685,6 +687,9 @@
   // the strong code roots list for this region
   void strong_code_roots_do(CodeBlobClosure* blk) const;
 
+  uint node_index() const { return _node_index; }
+  void set_node_index(uint node_index) { _node_index = node_index; }
+
   // Verify that the entries on the strong code root list for this
   // region are live and include at least one pointer into this region.
   void verify_strong_code_roots(VerifyOption vo, bool* failures) const;