[Bug c++/81408] Lots of new -Wunsafe-loop-optimizations warnings with 7 compared to 6

[jak@jak-linux.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81408

--- Comment #3 from Julian Andres Klode <jak@jak-linux.org> ---
7.1.0-9 corresponds to "SVN 20170705 (r250006) from the gcc-7-branch."