[llvm] [AArch64] Fix the emission of WinCFI for pac-ret+leaf and SCS (PR #147518)

[Anatoly Trosinenko via llvm-commits]

atrosinenko wrote:

For now, I rebased and un-drafted this PR after #140895 was merged - will add checks for assembly output soon.

https://github.com/llvm/llvm-project/pull/147518