[Bug libstdc++/63345] Multiple undefined behaviors (static_cast<>) in libstdc++-v3/include/bits

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63345

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I believe all the real problems are fixed now.