[gcc r12-6709] libstdc++: Remove unused std::pair helper function

[Jonathan Wakely]

https://gcc.gnu.org/g:72ce3fd2c72825c73ba6febae5aeb5c189f3f62c

commit r12-6709-g72ce3fd2c72825c73ba6febae5aeb5c189f3f62c
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Jan 18 21:21:47 2022 +0000

    libstdc++: Remove unused std::pair helper function
    
    This function is no longer used since r12-6691 and can be removed.
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/stl_pair.h (_PCC::_DeprConsPair): Remove unused
            function.

Diff:
---
 libstdc++-v3/include/bits/stl_pair.h | 14 --------------
 1 file changed, 14 deletions(-)

diff --git a/libstdc++-v3/include/bits/stl_pair.h b/libstdc++-v3/include/bits/stl_pair.h
index 8564fd1ae9e..0eb78345ca4 100644
--- a/libstdc++-v3/include/bits/stl_pair.h
+++ b/libstdc++-v3/include/bits/stl_pair.h
@@ -128,20 +128,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	return __and_<is_convertible<_U1&&, _T1>,
 		      is_convertible<_U2&&, _T2>>::value;
       }
-
-      template <bool __implicit, typename _U1, typename _U2>
-      static constexpr bool _DeprConsPair()
-      {
-	using __do_converts = __and_<is_convertible<_U1&&, _T1>,
-				     is_convertible<_U2&&, _T2>>;
-	using __converts = __conditional_t<__implicit,
-					   __do_converts,
-					   __not_<__do_converts>>;
-	return __and_<is_constructible<_T1, _U1&&>,
-		      is_constructible<_T2, _U2&&>,
-		      __converts
-		     >::value;
-      }
     };
 
   template <typename _T1, typename _T2>