Albert Wong: definition for regex_traits<_CharT>::__regex_word.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@176640 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/regex b/include/regex
index efd91ee..1156a3e 100644
--- a/include/regex
+++ b/include/regex
@@ -1009,6 +1009,10 @@
 };
 
 template <class _CharT>
+const typename regex_traits<_CharT>::char_class_type
+regex_traits<_CharT>::__regex_word;
+
+template <class _CharT>
 regex_traits<_CharT>::regex_traits()
 {
     __init();