[llvm] [BOLT][AArch64] Add support for long absolute LLD thunks/veneers (PR #113408)

[Maksim Panchenko via llvm-commits]

maksfb wrote:

@smithp35, thank you for the review. I agree that making veneers/thunks part of the ABI would have made job easier for tools. For now, we have to rely on name/pattern matching. I plan to add support for more thunk types (particularly short ones) after this PR.

Regarding absolute thunks in PIE/PIC, I believe you are right that a linker wouldn't generate such thunks even for absolute symbols. @paschalis-mpeis mentioned it in his review as well.

https://github.com/llvm/llvm-project/pull/113408