[Bug target/127650] `va_arg` of an over-aligned emits `movdqa` from an 8-mod-16 address and cause SIGSEGV

[ubizjak at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127650

--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
The ABI slot placement is unchanged by the fix: clang 21.1 places the argument
in the same 8-byte-aligned slot and its callee copies with unaligned loads; GCC
and clang callers/callees interoperate with each other.