[ADT] Use C++17 fold expression in PointerSumType (NFC)#159560

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

kazutakahirata:cleanup_20250917_ADT_PointerSumType_Checkerkazutakahirata/llvm-project:cleanup_20250917_ADT_PointerSumType_CheckerCopy head branch name to clipboard