Views triggers autoload needlessly

In handlers.inc, views checks for class existence for its handlers by using class_exists() with only one parameter.

On sites with autoload implementations like autoload.module, this causes theses implementations to trigger uselessly since loading is controlled by Views itself, causing extra load. The second parameter should therefore be passed as FALSE to avoid triggering autoload. This happens in _views_create_handler, views_include_handler, and views_get_table_join.