ELF: Use index 0 for unversioned undefined symbols#168189

MaskRay wants to merge 2 commits intomainllvm/llvm-project:mainfrom

users/MaskRay/spr/elf-use-index-0-for-unversioned-undefined-symbolsllvm/llvm-project:users/MaskRay/spr/elf-use-index-0-for-unversioned-undefined-symbolsCopy head branch name to clipboard