[Bug libstdc++/86880] Incorrect mersenne_twister_engine equality comparison between rotated states

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86880

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
We have the same problem with std::subtract_with_carry_engine. Its equality
operator doesn't work for rotated states.