[Bug target/102768] [feature request] Add compiler support for aarch64 shadow call stack

[ashimida at linux dot alibaba.com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102768

--- Comment #6 from ashimida <ashimida at linux dot alibaba.com> ---
RFC,v2: https://gcc.gnu.org/pipermail/gcc-patches/2021-November/585496.html