[clang] [llvm] [AArch64][PAC] Sign block addresses used in indirectbr. (PR #97647)

[Daniil Kovalev via llvm-commits]

kovdan01 wrote:

@ahmedbougacha I've updated my review: I've misinterpreted logic a bit previously, and thought that a couple of codepaths are not covered by tests. It's not true, everything is OK, but please address @efriedma-quic 's concern described above so this can be approved and merged.

https://github.com/llvm/llvm-project/pull/97647