if (extraDependencies) {
      return extraDependencies(op, /*incoming=*/true);
    } else {
      return empty_op_set;
    }
  };
  auto ctrlSuccessors =
      [&](Operation* op) -> llvm::SmallVector<mlir::Operation*, 4> const& {
    if (extraDependencies) {
      return extraDependencies(op, /*incoming=*/false);
    } else {
      return empty_op_set;
    }
  };