[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 #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Also exceptions larger than std::bad_alloc should not eat from the emergency
buffer but instead cause std::bad_alloc to be thrown?  Thus EMERGENCY_OBJ_SIZE
could be very much smaller.