This fixes a compilation error in debug mode, due to std::_Bit_reference
not being defined, because it's in namespace std::__cxx1998 instead. We
can refer to it as vector<bool>::reference instead, which always works.

That fixes some compilation errors in debug mode, but the tests fail at
run-time instead because the printers for vector<bool> helpers are only
registered for the std namespace, not std::__cxx1998. That is fixed by
using add_container to register the printers instead of add_version, as
the former registers them in the std and std::__cxx1998 namespaces.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	* python/libstdcxx/v6/printers.py (StdBitReferencePrinter): Use
	'std::vector<bool>::reference' as type name, not _Bit_reference.
	(build_libstdcxx_dictionary): Register printers for vector<bool>
	types in debug mode too.
	* testsuite/libstdc++-prettyprinters/simple.cc: Adjust expected
	output for invalid _Bit_reference. Use vector<bool>::reference
	instead of _Bit_reference.
	* testsuite/libstdc++-prettyprinters/simple11.cc: Likewise.

Tested powerpc64le-linux. Committed to trunk.