2011-11-19  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/debug/bitset (operator[](size_t) const): Declare constexpr.
	* include/profile/bitset: Likewise.
	* testsuite/23_containers/bitset/operations/constexpr.cc: Split out
	non portable bits to...
	* testsuite/23_containers/bitset/operations/constexpr-2.cc: ... here.
