--- old/src/hotspot/share/gc/g1/heapRegion.hpp	2019-11-19 15:50:33.588798103 +0100
+++ new/src/hotspot/share/gc/g1/heapRegion.hpp	2019-11-19 15:50:33.368796740 +0100
@@ -546,6 +546,7 @@
   }
 
   int age_in_surv_rate_group() const;
+  bool has_valid_age_in_surv_rate() const;
 
   bool has_surv_rate_group() const;