[clang] Migrate away from ArrayRef(std::nullopt) (NFC)#144982

kazutakahirata merged 1 commit intollvm:mainllvm/llvm-project:mainfrom

kazutakahirata:cleanup_20250619_nullopt_clangkazutakahirata/llvm-project:cleanup_20250619_nullopt_clangCopy head branch name to clipboard