Fix regression for libstdc++-v3/testsuite/29_atomics/atomic/62259.cc
as reported at <http://gcc.gnu.org/ml/gcc-patches/2015-04/msg00543.html>.

	* testsuite/29_atomics/atomic/62259.cc: Assert atomic
	alignment is larger-equal, not equal, to default alignment.

From-SVN: r222072