--- old/src/hotspot/share/gc/g1/g1RegionToSpaceMapper.hpp	2020-05-03 15:32:33.822374914 +0200
+++ new/src/hotspot/share/gc/g1/g1RegionToSpaceMapper.hpp	2020-05-03 15:32:33.554373586 +0200
@@ -51,7 +51,7 @@
 
   size_t _region_granularity;
   // Mapping management
-  CHeapBitMap _commit_map;
+  CHeapBitMap _region_commit_map;
 
   MemoryType _memory_type;
 
@@ -68,10 +68,6 @@
 
   virtual ~G1RegionToSpaceMapper() {}
 
-  bool is_committed(uintptr_t idx) const {
-    return _commit_map.at(idx);
-  }
-
   void commit_and_set_special();
   virtual void commit_regions(uint start_idx, size_t num_regions = 1, WorkGang* pretouch_workers = NULL) = 0;
   virtual void uncommit_regions(uint start_idx, size_t num_regions = 1) = 0;