[Bug middle-end/128010] aarch64 has no asm clobber syntax for the top bits of sve z regs needed by syscalls

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128010

--- Comment #6 from Drea Pinski <pinskia at gcc dot gnu.org> ---
The other way to fix this is to add a __builtin_linux_syscall function which
does the right thing always.