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/mutex b/include/mutex
index ee20f02..e2b5d6b 100644
--- a/include/mutex
+++ b/include/mutex
@@ -187,7 +187,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-class _LIBCPP_VISIBLE recursive_mutex
+class _LIBCPP_TYPE_VIS recursive_mutex
 {
     pthread_mutex_t __m_;
 
@@ -209,7 +209,7 @@
     native_handle_type native_handle() {return &__m_;}
 };
 
-class _LIBCPP_VISIBLE timed_mutex
+class _LIBCPP_TYPE_VIS timed_mutex
 {
     mutex              __m_;
     condition_variable __cv_;
@@ -251,7 +251,7 @@
     return false;
 }
 
-class _LIBCPP_VISIBLE recursive_timed_mutex
+class _LIBCPP_TYPE_VIS recursive_timed_mutex
 {
     mutex              __m_;
     condition_variable __cv_;
@@ -425,7 +425,7 @@
 
 #endif  // _LIBCPP_HAS_NO_VARIADICS
 
-struct _LIBCPP_VISIBLE once_flag;
+struct _LIBCPP_TYPE_VIS once_flag;
 
 #ifndef _LIBCPP_HAS_NO_VARIADICS
 
@@ -441,7 +441,7 @@
 
 #endif  // _LIBCPP_HAS_NO_VARIADICS
 
-struct _LIBCPP_VISIBLE once_flag
+struct _LIBCPP_TYPE_VIS once_flag
 {
     _LIBCPP_INLINE_VISIBILITY
     _LIBCPP_CONSTEXPR