re PR libstdc++/48476 ([C++0x] conversion between std::tuple which have reference member is rejected)

2011-04-12  Takaya Saito  <gintensubaru@gmail.com>

	PR libstdc++/48476
	* include/std/tuple (_Tuple_impl<>::_Tuple_impl(_Tuple_impl<>&&),
	_Tuple_impl<>::operator=(_Tuple_impl&&), _Tuple_impl<>::operator=
	(_Tuple_impl<>&&), tuple_cat): Use std::forward where appropriate.
	* testsuite/20_util/tuple/cons/48476.cc: New.
	* testsuite/20_util/tuple/48476.cc: Likewise.
	* testsuite/20_util/tuple/creation_functions/48476.cc: Likewise.

From-SVN: r172309