[Bug middle-end/92059] Crash on tr2::dynamic_bitset::operator=() with optimization

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92059

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Be aware that everything in the tr2 directory is unmaintained and untouched for
years.