[Bug libstdc++/122172] [16 Regression] 1571 regressions due to std::make_unsigned<_Atomic_word> since r16-3810

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122172

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
With this corresponding change too:

--- a/libstdc++-v3/include/bits/shared_ptr_base.h
+++ b/libstdc++-v3/include/bits/shared_ptr_base.h
@@ -233,7 +233,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
        // If long is wider than _Atomic_word then we can treat _Atomic_word
        // as unsigned, and so double its usable range. If the widths are the
        // same then casting to unsigned and then to long is a no-op.
-       using _Up = typename make_unsigned<_Atomic_word>::type;
+       using _Up = _Atomic_word_unsigned;

         // No memory barrier is used here so there is no synchronization
         // with other threads.
@@ -300,8 +300,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     inline long
     _Sp_counted_base<_S_single>::_M_get_use_count() const noexcept
     {
-      using _Up = typename make_unsigned<_Atomic_word>::type;
-      return (_Up) _M_use_count;
+      return (_Atomic_word_unsigned) _M_use_count;
     }