[clang] Remove a redundant check in Mangle. NFC#95071

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

samolisov:clang/remove-redundant-isa-block-decl-checksamolisov/llvm-project:clang/remove-redundant-isa-block-decl-checkCopy head branch name to clipboard