rebalance the object cache octrees.

indra/newview/pipeline.cpp

@@ -2103,6 +2103,13 @@ void LLPipeline::updateMove()
 					part->mOctree->balance();
 				}
 			}
+
+			//balance the VO Cache tree
+			LLVOCachePartition* vo_part = region->getVOCachePartition();
+			if(vo_part)
+			{
+				vo_part->mOctree->balance();
+			}
 		}
 	}
 }