--- old/src/share/vm/gc/g1/heapRegionManager.hpp	2015-08-11 11:44:07.434644062 -0400
+++ new/src/share/vm/gc/g1/heapRegionManager.hpp	2015-08-11 11:44:06.830609332 -0400
@@ -241,6 +241,9 @@
   // Return the actual number of uncommitted regions.
   uint shrink_by(uint num_regions_to_remove);
 
+  // Uncommit the region at the specified index, which must be available and free.
+  void shrink_at(uint index);
+
   void verify();
 
   // Do some sanity checking.