[Bug c++/86094] [8/9 Regression] Call ABI changed for small objects with defaulted ctor

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86094

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is controlled by -fabi-version=12 (the default in gcc 8).