[Bug libstdc++/90436] Redundant size checking in vector

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90436

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
Adding

if(size()>max_size())__builtin_unreachable())

sometimes helps, depending where you add it and in what exact form.