xo-gc: retire DX1Collector._snap_move_checkpoint()

xo-gc/include/xo/gc/DX1Collector.hpp

@@ -378,11 +378,11 @@ namespace xo {
             void * _deep_move_root(obj<AGCObject> from_src, Generation upto);
             /** Common driver for _deep_move_root(), _deep_move_interior() **/
             void * _deep_move_gc_owned(void * from_src, Generation upto);
-#endif
             /** snap checkpoint containing allocator state
              *  use to detect forwarding activity after visiting objects
              **/
             GCMoveCheckpoint _snap_move_checkpoint(Generation upto);
+#endif
 
             /** traverse objects allocated after @p ckp, to make sure their children
              *  are forwarded. Repeat until traverse doesn't find any unforwarded children

xo-gc/src/gc/DX1Collector.cpp

@@ -812,11 +812,13 @@ namespace xo {
         } /*_deep_move_gc_owned*/
 #endif
 
+#ifdef OBSOLETE
         auto
         DX1Collector::_snap_move_checkpoint(Generation upto) -> GCMoveCheckpoint
         {
             return gco_store_.snap_move_checkpoint(upto);
         }
+#endif
 
         void
         DX1Collector::_forward_children_until_fixpoint(Generation upto,