[libunwind] libunwind: Implement the unw_strerror function for better nongnu libunwind compatibility (PR #160887)

[Gleb Popov via cfe-commits]

arrowd wrote:

I don't think this little detail is worth arguing. What's more important (at least to me) is why the PR is closed and if it is now rejected or still has a chance to get merged.

https://github.com/llvm/llvm-project/pull/160887