[Bug libgcc/71744] Concurrently throwing exceptions is not scalable

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71744

--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I'll bootstrap/regtest it today.  That said, have you done any scalability
benchmarking with/without that patch?