Dimitry Andric:  many visibility fixes.  Howard:  Much appreciated.  Can you send me a patch to CREDITS.TXT?

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@163862 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/stack b/include/stack
index 59906bd..12fb35b 100644
--- a/include/stack
+++ b/include/stack
@@ -91,13 +91,15 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-template <class _Tp, class _Container> class stack;
+template <class _Tp, class _Container> class _LIBCPP_VISIBLE stack;
 
 template <class _Tp, class _Container>
+_LIBCPP_INLINE_VISIBILITY
 bool
 operator==(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y);
 
 template <class _Tp, class _Container>
+_LIBCPP_INLINE_VISIBILITY
 bool
 operator< (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y);