[Bug tree-optimization/114385] -Wrestrict false positive creating std::string from iterators

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114385

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This also works:
if (end < begin) __builtin_unreachable();