re PR c++/53594 ([C++11] Spurious -Wuninitialized warning for member with NSDMI)

	PR c++/53594
	* class.c (check_bases_and_members): Avoid -Wuninitialized
	diagnostics for non-static const members or references if they
	use NSDMI.

	* g++.dg/cpp0x/nsdmi7.C: New test.

From-SVN: r188925