[ADT] Remove an extraneous variable (NFC)#144937

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

kazutakahirata:cleanup_20250619_cast_PointerIntPairkazutakahirata/llvm-project:cleanup_20250619_cast_PointerIntPairCopy head branch name to clipboard