message: Don't use an IterationLoop for main indexer.
  This causes the indexer to exit.
diff: @@ -625,8 +625,7 @@ void Indexer_Main(Config* config,
  // Build one index per-indexer, as building the index acquires a global lock.
  auto indexer = IIndexer::MakeClangIndexer();
  - IterationLoop loop;
  - while (loop.Next()) {
  + while (true) {
  bool did_work = false;
  {
  