Cleanup superfluous std:: qualifiers in <type_traits>

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@269998 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/type_traits b/include/type_traits
index ad32376..a8b0bd0 100644
--- a/include/type_traits
+++ b/include/type_traits
@@ -1008,8 +1008,8 @@
 };
 
 template <class _Tp>
-struct __is_referenceable : std::integral_constant<bool,
-    !std::is_same<decltype(__is_referenceable_impl::__test<_Tp>(0)), __two>::value> {};
+struct __is_referenceable : integral_constant<bool,
+    !is_same<decltype(__is_referenceable_impl::__test<_Tp>(0)), __two>::value> {};
 
 
 // add_const
@@ -2177,7 +2177,7 @@
 template <class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 _Tp&&
-forward(typename std::remove_reference<_Tp>::type& __t) _NOEXCEPT
+forward(typename remove_reference<_Tp>::type& __t) _NOEXCEPT
 {
     return static_cast<_Tp&&>(__t);
 }
@@ -2185,9 +2185,9 @@
 template <class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 _Tp&&
-forward(typename std::remove_reference<_Tp>::type&& __t) _NOEXCEPT
+forward(typename remove_reference<_Tp>::type&& __t) _NOEXCEPT
 {
-    static_assert(!std::is_lvalue_reference<_Tp>::value,
+    static_assert(!is_lvalue_reference<_Tp>::value,
                   "Can not forward an rvalue as an lvalue.");
     return static_cast<_Tp&&>(__t);
 }
@@ -2213,7 +2213,7 @@
 template <class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY
 _Tp&
-forward(typename std::remove_reference<_Tp>::type& __t) _NOEXCEPT
+forward(typename remove_reference<_Tp>::type& __t) _NOEXCEPT
 {
     return __t;
 }
@@ -4568,7 +4568,7 @@
 #endif // _LIBCPP_UNDERLYING_TYPE
 
 
-template <class _Tp, bool = std::is_enum<_Tp>::value>
+template <class _Tp, bool = is_enum<_Tp>::value>
 struct __sfinae_underlying_type
 {
     typedef typename underlying_type<_Tp>::type type;