[libc++][ranges] Fix incorrect integer typedef in `elements_view` test.

[ldionne]

libcxx/test/std/ranges/range.adaptors/range.elements/sentinel/minus.pass.cpp

27

35

[var-const]

Feedback

libcxx/test/std/ranges/range.adaptors/range.elements/sentinel/minus.pass.cpp

 //
 // template<bool OtherConst>
 //   requires sized_sentinel_for<sentinel_t<Base>, iterator_t<maybe-const<OtherConst, V>>>
 // friend constexpr range_difference_t<maybe-const<OtherConst, V>>
 //   operator-(const sentinel& x, const iterator<OtherConst>& y);
 
 #include <cassert>
 #include <concepts>
+#include <cstddef>
 #include <functional>
 #include <ranges>
 #include <tuple>
 
 #include "../types.h"
 
 template <bool Const>
 struct Iter {
   std::tuple<int>* it_;
 
   using value_type       = std::tuple<int>;
-  using difference_type  = intptr_t;
+  using difference_type  = std::ptrdiff_t;
   using iterator_concept = std::input_iterator_tag;
 
   constexpr decltype(auto) operator*() const { return *it_; }
   constexpr Iter& operator++() {
     ++it_;
     return *this;
   }
   constexpr void operator++(int) { ++it_; }