[Bug middle-end/115832] Very slow compilation with `-fsanitize=undefined -O2` and std::sort

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115832

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Also is your clang still using libstdc++ or is it using libc++?