add GPU performance debug and simple loop analysis
Merge branch 'develop' of https://github.com/stanford-ppl/Delite into develop
Merge branch 'develop' of https://github.com/stanford-ppl/Delite into develop
Merge branch 'develop' of https://github.com/stanford-ppl/Delite into develop
some fixes for GPU external op
fix compile error in optigraph app