http://llvm.org/bugs/show_bug.cgi?id=10390

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@135393 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/memory b/include/memory
index 3a0064a..1972d06 100644
--- a/include/memory
+++ b/include/memory
@@ -595,6 +595,7 @@
 #include <limits>
 #include <iterator>
 #include <__functional_base>
+#include <iosfwd>
 #if defined(_LIBCPP_NO_EXCEPTIONS)
     #include <cassert>
 #endif
@@ -4148,6 +4149,11 @@
     }
 };
 
+template<class _CharT, class _Traits, class _Y>
+inline _LIBCPP_INLINE_VISIBILITY
+basic_ostream<_CharT, _Traits>&
+operator<<(basic_ostream<_CharT, _Traits>& __os, shared_ptr<_Y> const& __p);
+
 //enum class
 struct _LIBCPP_VISIBLE pointer_safety
 {