Fix for LWG2454: Add raw_storage_iterator::base() member

llvm-svn: 236948
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 783b372a580c59bb3aae3b37f32df17b3a2b3928
diff --git a/include/memory b/include/memory
index 93e8f67..3f7ea1a 100644
--- a/include/memory
+++ b/include/memory
@@ -1855,6 +1855,9 @@
     _LIBCPP_INLINE_VISIBILITY raw_storage_iterator& operator++() {++__x_; return *this;}
     _LIBCPP_INLINE_VISIBILITY raw_storage_iterator  operator++(int)
         {raw_storage_iterator __t(*this); ++__x_; return __t;}
+#if _LIBCPP_STD_VER >= 14
+    _LIBCPP_INLINE_VISIBILITY _OutputIterator base() const { return __x_; } 
+#endif
 };
 
 template <class _Tp>