[Polly][Refactor] IslAst [6/7]

[Johannes Doerfert]

How do we proceed now? I need to get a lot more patches out (at least one
the list) and I have little time left.

I either (a) commit this patch with the changed comments, or (b) rebase the
next one to work without this one and forget about it for now.

Just tell me if you want to stick with the old flags for now.

--

Johannes Doerfert
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by
The Linux Foundation