--- a/hotspot/src/share/vm/gc_implementation/g1/heapRegion.hpp	Mon Mar 09 08:22:34 2015 +0100
+++ b/hotspot/src/share/vm/gc_implementation/g1/heapRegion.hpp	Mon Jan 26 10:32:35 2015 +0100
@@ -236,8 +236,6 @@
 
   // For a humongous region, region in which it starts.
   HeapRegion* _humongous_start_region;
-  // True iff the region is in current collection_set.
-  bool _in_collection_set;
 
   // True iff an attempt to evacuate an object in the region failed.
   bool _evacuation_failed;
@@ -487,13 +485,8 @@
     return _rem_set;
   }
 
-  // True iff the region is in current collection_set.
-  bool in_collection_set() const {
-    return _in_collection_set;
-  }
-  void set_in_collection_set(bool b) {
-    _in_collection_set = b;
-  }
+  bool in_collection_set() const;
+
   HeapRegion* next_in_collection_set() {
     assert(in_collection_set(), "should only invoke on member of CS.");
     assert(_next_in_special_set == NULL ||