Convert CUDA scan kernel to use the index-less version of dereference.
Convert CUDA scan kernel to use the index-less version of dereference.

--HG--
extra : convert_revision : svn%3A83215879-3e5a-4751-8c9d-778f44bb06a5/trunk%40678

jbrownbridge/thrust,jbrownbridge/thrust,jbrownbridge/thrust,jbrownbridge/thrust