* python/libstdcxx/v6/printers.py (_use_gdb_pp): New global.
	Try to import `gdb.printing' module.
	(UniquePointerPrinter.__init__): Add 'typename' argument.
	(StdSlistPrinter.__init__): Likewise.
	(StdSlistIteratorPrinter.__init__): Likewise.
	(StdVectorIteratorPrinter.__init__): Likewise.
	(StdRbtreeIteratorPrinter.__init__): Likewise.
	(StdDebugIteratorPrinter.__init__): Likewise.
	(StdDequeIteratorPrinter.__init__): Likewise.
	(StdStringPrinter.__init__): Likewise.
	(RxPrinter, Printer): New class.
	(libstdcxx_printer): New global.
	(register_libstdcxx_printers): Rewrite.
	(build_libstdcxx_dictionary): Rewrite.
	(pretty_printers_dict): Remove.

From-SVN: r170958