Update for RegionInfo changes.

Mostly related to missing includes and renaming of
the pass to RegionInfoPass.

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@213457 91177308-0d34-0410-b5e6-96231b3b80d8
Update formatting with clang-format.

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@213468 91177308-0d34-0410-b5e6-96231b3b80d8