[libunwind] [libunwind] Add length info for dynamic .eh_frame registration (PR #77185)

[via cfe-commits]

https://github.com/lhames requested changes to this pull request.

As @arichardson noted this would break the ABI.

The best solution is to fix the implementation of `__unw_add_dynamic_eh_frame_section` (and `__unw_remove_dynamic_eh_frame_section`) as described in https://github.com/llvm/llvm-project/issues/76957#issuecomment-1879977544.

https://github.com/llvm/llvm-project/pull/77185