[Bug lto/82172] Destruction of basic_string in basic_stringbuf::overflow with _GLIBCXX_USE_CXX11_ABI=0, -flto, and C++17 mode results in invalid delete

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82172

--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I have no idea what PREVAILING_DEF_IRONLY means, but a web search found
https://sourceware.org/bugzilla/show_bug.cgi?id=12370 -- I can't tell if that's
relevant.