Preparation::libmesh_assert_consistent()

I haven't actually seen this fail yet but it does seem like the sort of
thing we should be checking.

Author: roystgnr

include/mesh/mesh_base.h

@@ -2076,6 +2076,18 @@ class MeshBase : public ParallelObject
              has_reinit_ghosting_functors == other.has_reinit_ghosting_functors &&
              has_boundary_id_sets == other.has_boundary_id_sets;
     }
+
+    void libmesh_assert_consistent (const Parallel::Communicator & libmesh_dbg_var(comm)) {
+      libmesh_assert(comm.verify(is_partitioned));
+      libmesh_assert(comm.verify(has_synched_id_counts));
+      libmesh_assert(comm.verify(has_neighbor_ptrs));
+      libmesh_assert(comm.verify(has_cached_elem_data));
+      libmesh_assert(comm.verify(has_interior_parent_ptrs));
+      libmesh_assert(comm.verify(has_removed_remote_elements));
+      libmesh_assert(comm.verify(has_removed_orphaned_nodes));
+      libmesh_assert(comm.verify(has_reinit_ghosting_functors));
+      libmesh_assert(comm.verify(has_boundary_id_sets));
+    }
   };
 
 protected: