[Bug target/96061] Please support 'no_caller_saved_registers' attribute on aarch64 (or maybe on all targets)

[alex.popov at linux dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96061

--- Comment #2 from Alexander Popov <alex.popov at linux dot com> ---
> We are working on -fzero-call-used-regs:

H.J. Lu, thanks for the information!

However, this flag can't be used per-function, like the attribute.
So supporting 'no_caller_saved_registers' attribute for aarch64 (and maybe
other architectures) is desired anyway.

Thanks!