Remove unused code from __functional_base. NFC.

Patch from Arthur O'Dwyer.

`__user_alloc_construct_impl` is used by <experimental/memory_resource>, but
this `__user_alloc_construct` is never used.

Also, `<experimental/memory_resource>` doesn't need a full definition of
`std::tuple`; just the forward declaration in `<__tuple>` will suffice.

Reviewed as https://reviews.llvm.org/D46806

llvm-svn: 334069
GitOrigin-RevId: cb5b004a9b2ed3e3d0d1636628549bfc0fbe6716

include/__functional_base

diff --git a/include/__functional_base b/include/__functional_base
index 12af4dc..1a90bd6 100644
--- a/include/__functional_base
+++ b/include/__functional_base
@@ -646,16 +646,6 @@
     new (__storage) _Tp (_VSTD::forward<_Args>(__args)..., __a);
 }
 
-// FIXME: Theis should have a version which takes a non-const alloc.
-template <class _Tp, class _Allocator, class... _Args>
-inline _LIBCPP_INLINE_VISIBILITY
-void __user_alloc_construct (_Tp *__storage, const _Allocator &__a, _Args &&... __args)
-{ 
-    __user_alloc_construct_impl( 
-             __uses_alloc_ctor<_Tp, _Allocator>(), 
-             __storage, __a, _VSTD::forward<_Args>(__args)...
-        );
-}
 #endif  // _LIBCPP_CXX03_LANG
 
 _LIBCPP_END_NAMESPACE_STD

include/experimental/memory_resource

diff --git a/include/experimental/memory_resource b/include/experimental/memory_resource
index 748e2e7..221ce5b 100644
--- a/include/experimental/memory_resource
+++ b/include/experimental/memory_resource
@@ -71,7 +71,7 @@
 #include <memory>
 #include <new>
 #include <stdexcept>
-#include <tuple>
+#include <__tuple>
 #include <type_traits>
 #include <utility>
 #include <cstddef>
@@ -96,7 +96,7 @@
 }
 
 // 8.5, memory.resource
-class _LIBCPP_TEMPLATE_VIS memory_resource
+class _LIBCPP_TYPE_VIS memory_resource
 {
     static const size_t __max_align = alignof(max_align_t);