message: always include root store as a dependency
diff: @@ -53,6 +53,11 @@ DexStoresDependencies build_transitive_resolved_dependencies(
  auto it = transitive_resolved_dependencies.find(store);
  if (it == transitive_resolved_dependencies.end()) {
  DexStoreDependencies deps;
  + if (store != &root_store) {
  + // It's safe and convenient to have an implicit dependency on the root
  + // store, as the root store is always present.
  + deps.insert(&root_store);
  + }
  for (auto& dependency_name : store->get_dependencies()) {
  auto it2 = named_stores.find(dependency_name);
  if (it2 == named_stores.end()) {
  