[lld] draft: [lld] Add thunks for hexagon (PR #111217)

[Brian Cain via llvm-commits]

androm3da wrote:

@quic-akaryaki has fixed the remaining test failures with this patch.  Thanks Alexey!

I'll audit it later this week and probably mark it ready for review then.

https://github.com/llvm/llvm-project/pull/111217