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

[matz at gcc dot gnu.org]

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

--- Comment #5 from Michael Matz <matz at gcc dot gnu.org> ---
Yes, we (intentionally) haven't required any extensions to happen for arguments
or return values smaller than 64bit (e.g. we haven't even specified that
arguments <= 32bit would be zero-extended in the high bits, as would have been
natural with the instruction set).  If LLVM relies on that it would be a bug.