Copied region cloning into polly tree and added patch for fixing phi's in successors of region.

--HG--
extra : rebase_source : 79c9009d7089558baccec438e81309393e0467f1
extra : amend_source : 2a6632ee2a105b084c9b78aa46930604667b193d
extra : source : 0f1e009a646352cf33b8017ca891314d8ba0683f