[clang] [compiler-rt] [llvm] [PAC][AArch64] Support init/fini array signing (PR #96478)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

There's some followup discussion suggesting a different IR representation at https://github.com/llvm/llvm-project/pull/102199#discussion_r1706094411 .  

https://github.com/llvm/llvm-project/pull/96478