[PATCH 00/21] aarch64: Add support for SME

[Richard Sandiford]

This series of patches adds support for SME.  A follow-on series
will add SME2 on top.

All of the detail is in the individual patch summaries.

The series can't go in yet, because it depends on:

  https://gcc.gnu.org/pipermail/gcc-patches/2023-September/629713.html

and some reviewed-but-unpushed patches that follow on from it.

The series also depends on some patches that I posted last year and were
approved (thanks!), but that I didn't commit at the time because the SME
support didn't go in then.  I'll repost those when I push them.

Tested on aarch64-linux-gnu.  I tested on top of the late-combine pass,
so that might also be an unintentional dependency.

Richard