message: bench: bench.h fixes and improvements
diff: /*
  * Usage:
  -static void CODE_TO_TIME(benchmark::Bench& bench)
  +static void NameOfYourBenchmarkFunction(benchmark::Bench& bench)
  {
  ...do any setup needed...
  - nanobench::Config().run([&] {
  - ... do stuff you want to time...
  +
  + bench.run([&] {
  + ...do stuff you want to time; refer to src/bench/nanobench.h
  + for more information and the options that can be passed here...
  });
  +
  ...do any cleanup needed...
  }
  -BENCHMARK(CODE_TO_TIME);
  +BENCHMARK(NameOfYourBenchmarkFunction);
  */
  @@ -55,7 +58,8 @@ public:
  static void RunAll(const Args& args);
  };
  -}
  +} // namespace benchmark
  +
  // BENCHMARK(foo) expands to: benchmark::BenchRunner bench_11foo("foo", foo);
  #define BENCHMARK(n) \
  benchmark::BenchRunner PASTE2(bench_, PASTE2(__LINE__, n))(STRINGIZE(n), n);
  