[llvm] Fix crash due to un-checked error in LVReaderHandler::handleArchive method (PR #118951)

[via llvm-commits]

aurelien35 wrote:

@tstellar : I've added  a README.md file which explains how I generated the .lib file

However, I don't know how where generated the other binary files in this directory

https://github.com/llvm/llvm-project/pull/118951