message: bench: prefer a steady clock if the resolution is no worse
  This is a port of Core (2nd commit)
diff: @@ -39,7 +39,16 @@ BENCHMARK(CODE_TO_TIME);
  namespace benchmark
  {
  -using clock = std::chrono::high_resolution_clock;
  +// On many systems, the high_resolution_clock offers no better resolution than the steady_clock.
  +// If that's the case, prefer the steady_clock.
  +struct best_clock
  +{
  + using hi_res_clock = std::chrono::high_resolution_clock;
  + using steady_clock = std::chrono::steady_clock;
  + static constexpr bool steady_is_high_res = std::ratio_less_equal<steady_clock::period, hi_res_clock::period>::value;
  + using type = std::conditional<steady_is_high_res, steady_clock, hi_res_clock>::type;
  +};
  +using clock = best_clock::type;
  using time_point = clock::time_point;
  using duration = clock::duration;
  