[Polly][NewPM] Port IslAst to the new ScopPassManager
Summary: This patch ports IslAst to the new PM. The change is mostly straightforward. The only major modification required is making IslAst move-only, to correctly manage the isl resources it owns.
Reviewers: grosser, Meinersbur
Reviewed By: grosser
Subscribers: nemanjai, pollydev, llvm-commits
Tags: #polly
Differential Revision: https://reviews.llvm.org/D33422
git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@303622 91177308-0d34-0410-b5e6-96231b3b80d8