void getReferenceCountInfoTestHook(ConcurrentMap<Long, List<RefCountChangeInfo>> stacktraces,
      long address) {
    // nothing
  }
This method is overridden during testing to allow simulation of a concurrent update occurring
between stacktraces.get and stacktraces.replace
geode-core/src/main/java/org/apache/geode/internal/offheap/ReferenceCountHelperImpl.java