Method pop_back

ext/include/llvm/Support/JSON.h:195–195

    V.emplace_back(std::forward<Args>(A)...);
  }
  void pop_back() { V.pop_back(); }
  // FIXME: insert() takes const_iterator since C++11, old libstdc++ disagrees.
  iterator insert(iterator P, const Value &E) { return V.insert(P, E); }
  iterator insert(iterator P, Value &&E) {