[lld] [LLD][ELF][AArch64] Add BTI Aware long branch thunks (PR #108989)

[Peter Smith via llvm-commits]

smithp35 wrote:

I've created https://github.com/llvm/llvm-project/pull/116402 to fix the repro in https://crbug.com/377438309#comment8 I've not got a regression test yet as that will take some time to get one small enough. I hope to add one next week.

https://github.com/llvm/llvm-project/pull/108989