Restrict optimized __pad_and_output implementation detail to desired releases.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@167980 91177308-0d34-0410-b5e6-96231b3b80d8

include/locale

@@ -192,6 +192,10 @@ template <class charT> class messages_byname;
 #include <nl_types.h>
 #endif  // !_WIN32
 
+#if __APPLE__
+#include <Availability.h>
+#endif
+
 #include <__undef_min_max>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -1587,6 +1591,10 @@ __pad_and_output(_OutputIterator __s,
     return __s;
 }
 
+#if !defined(__APPLE__) || \
+    (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED > __MAC_10_8) || \
+    (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && __IPHONE_OS_VERSION_MIN_REQUIRED > __IPHONE_6_0)
+
 template <class _CharT, class _Traits>
 _LIBCPP_HIDDEN
 ostreambuf_iterator<_CharT, _Traits>
@@ -1633,6 +1641,8 @@ __pad_and_output(ostreambuf_iterator<_CharT, _Traits> __s,
     return __s;
 }
 
+#endif
+
 template <class _CharT, class _OutputIterator>
 _OutputIterator
 num_put<_CharT, _OutputIterator>::do_put(iter_type __s, ios_base& __iob,