[Bug target/92821] Miscompilation when passing 8-bit enum to extern function

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92821

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Note that for most types one ends up with zero or sign extension already due to
C/C++ promotion rules, though in the ABI still can't use that as guarantee, but
C++ typed enums aren't promoted.