* lib/g++-dg.exp (g++-dg-runtest): Run tests in C++1y mode, too.
	* lib/target-supports.exp (check_effective_target_c++11): Now
	means C++11 and up.
	(check_effective_target_c++11_only): New.
	(check_effective_target_c++11_down): New.
	(check_effective_target_c++1y): New.
	(check_effective_target_c++1y_only): New.
	(check_effective_target_c++98_only): Rename from
	check_effective_target_c++98.
	* g++.dg/*: Use { target c++11 } instead of -std=c++11.

From-SVN: r208416