[llvm] [AArch64][BTI] Mark EH landing pads as jump targets (PR #149680)

[Benjamin Herrenschmidt via llvm-commits]

ozbenh wrote:

So it looks like (with clang15) the `bti j` is generated unwinder is landing on the instruction *after* the newly inserted `bti` ... at least from a quick "next" with gdb (it's possible that gdb go that wrong, I haven't single stepped the whole way, I probably won't have time today).

https://github.com/llvm/llvm-project/pull/149680