No functionality change at this time.  I've split _LIBCPP_VISIBLE up into two flags: _LIBCPP_TYPE_VIS and _LIBCPP_FUNC_VIS.  This is in preparation for taking advantage of clang's new __type_visibility__ attribute.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@176593 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/unordered_set b/include/unordered_set
index 279e907..119251d 100644
--- a/include/unordered_set
+++ b/include/unordered_set
@@ -313,7 +313,7 @@
 
 template <class _Value, class _Hash = hash<_Value>, class _Pred = equal_to<_Value>,
           class _Alloc = allocator<_Value> >
-class _LIBCPP_VISIBLE unordered_set
+class _LIBCPP_TYPE_VIS unordered_set
 {
 public:
     // types
@@ -725,7 +725,7 @@
 
 template <class _Value, class _Hash = hash<_Value>, class _Pred = equal_to<_Value>,
           class _Alloc = allocator<_Value> >
-class _LIBCPP_VISIBLE unordered_multiset
+class _LIBCPP_TYPE_VIS unordered_multiset
 {
 public:
     // types