[Bug libstdc++/63400] [C++11]precision of std::chrono::high_resolution_clock

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63400

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
What libstdc++ is doing is sensible, why is the realtime clock so much coarser
than the monotonic clock on mingw-w64?