[Bug libstdc++/81476] severe slow-down with range-v3 library compared to clang

[h2+bugs at fsfe dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81476

--- Comment #19 from Hannes Hauswedell <h2+bugs at fsfe dot org> ---
One last question: will the fix be backported to GCC7('s libstdc++)?

Thanks!