[ADT] Refactor SmallPtrSetIterator (NFC)#160814

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

kazutakahirata:cleanup_20250925_ADT_SmallPtrSetIteratorkazutakahirata/llvm-project:cleanup_20250925_ADT_SmallPtrSetIteratorCopy head branch name to clipboard