Reland "[libclang] Always Dup in createRef(StringRef)"#127078

vitalybuka merged 2 commits intomainllvm/llvm-project:mainfrom

revert-127076-revert-125020-users/vitalybuka/spr/libclang-always-dup-in-createrefllvm/llvm-project:revert-127076-revert-125020-users/vitalybuka/spr/libclang-always-dup-in-createrefCopy head branch name to clipboard