== Progress == * TCWG-653 Add interworking thunks to LLD

Investigated and reported upstream bug in existing implementation. This has been fixed by reverting the change that introduced it. Got some feedback about whether I would need to strictly follow existing Thunk implementation.

Implemented an alternative thunk mechanism that should generalise to supporting range extension and interworking thunks. It is passing the existing lld regression tests.

== Plans ==

Finish off support for and add tests for ARM/Thumb interwork. Tidy up and submit upstream.