[v3] Implement LWG 2004

[Paolo Carlini]

Hi,

tested x86_64-linux, committed to mainline.

Paolo.

///////////////////

2011-08-31  Paolo Carlini  <paolo.carl...@oracle.com>

        * include/std/chrono (operator*(const _Rep1&, const duration<>&)):
        Fix order of template parameters per LWG 2004.

Index: include/std/chrono
===================================================================
--- include/std/chrono  (revision 178363)
+++ include/std/chrono  (working copy)
@@ -395,7 +395,7 @@
        return __cd(__cd(__d).count() * __s);
       }
 
-    template<typename _Rep1, typename _Period, typename _Rep2>
+    template<typename _Rep1, typename _Rep2, typename _Period>
       constexpr
       duration<typename __common_rep_type<_Rep2, _Rep1>::type, _Period>
       operator*(const _Rep1& __s, const duration<_Rep2, _Period>& __d)