[Bug libstdc++/64535] Emergency buffer for exception allocation too small

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64535

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Seeing that we have EH reference counted makes me think we should simply have
a single global std::bad_alloc EH to re-use?