[PATCH] [Polly] Allow to annotate alias scopes in the new SCoP.

[Johannes Doerfert]

Could you take a quick look at http://reviews.llvm.org/D5575
I changed it according to your comments and added a second refactoring
patch to rename the LoopAnnotator to ScopAnnotator.

- {F193710, layout=link}

http://reviews.llvm.org/D5563