[clang] [llvm] [AArch64][PAC] Handle signing of init/fini pointers in AsmPrinter (PR #193087)

[Oliver Hunt via cfe-commits]

ojhunt wrote:

> @ojhunt A kind reminder on the question above regarding your downstream pass potentially overlapping with this PR

Lets just land this - I'm not sure that what happens downstream currently is necessarily the best plan -- I'll need to talk to Ahmed 

https://github.com/llvm/llvm-project/pull/193087