[Bug target/111930] aarch64: SME should be supported

[rsandifo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111930

--- Comment #4 from Richard Sandiford <rsandifo at gcc dot gnu.org> ---
(In reply to Xi Ruoyao from comment #3)
> Note that now we have only 2 weeks before GCC 14 stage 1 ends.
Yeah, I'm aware. :)