code: public UBench addLongTask(String name, LongSupplier task) {
          return addLongTask(name, task, null);
      }
docs: Include a long-specialized named task in to the benchmark.
  
  @param name
  The name of the task. Only one task with any one name is
  allowed.
  @param task
  The task to perform
  @return The same object, for chaining calls.