LLVM libunwind is an implementation of the interface defined by the HP libunwind project. It was contributed Apple as a way to enable clang++ to port to platforms that do not have a system unwinder. It is intended to be a small and fast implementation of the ABI, leaving off some features of HP's libunwind that never materialized (e.g. remote unwinding).
acquired package info from repodata DB: repodata/f49862b7ac3402ebeffc0dcbd02ffdd49deb2ce82b41f6605a8845a23794f2aa-primary.sqlite.bz2
Unversioned shared library for LLVM libunwind