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/e5f38ba4169a71daafe2fb47abf7ae468a296eb65a434bbe3807eeb03acf9346-primary.sqlite.bz2
Unversioned shared library for LLVM libunwind