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/strstream b/include/strstream
index 5eadefd..81eef2a 100644
--- a/include/strstream
+++ b/include/strstream
@@ -137,7 +137,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-class _LIBCPP_VISIBLE strstreambuf
+class _LIBCPP_TYPE_VIS strstreambuf
     : public streambuf
 {
 public:
@@ -228,7 +228,7 @@
 
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 
-class _LIBCPP_VISIBLE istrstream
+class _LIBCPP_TYPE_VIS istrstream
     : public istream
 {
 public:
@@ -281,7 +281,7 @@
     strstreambuf __sb_;
 };
 
-class _LIBCPP_VISIBLE ostrstream
+class _LIBCPP_TYPE_VIS ostrstream
     : public ostream
 {
 public:
@@ -334,7 +334,7 @@
     strstreambuf __sb_; // exposition only
 };
 
-class _LIBCPP_VISIBLE strstream
+class _LIBCPP_TYPE_VIS strstream
     : public iostream
 {
 public: