CodePreparation: Comment and format the file properly

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@177781 91177308-0d34-0410-b5e6-96231b3b80d8
DeadCodeElimination: clang-format and comment

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@177782 91177308-0d34-0410-b5e6-96231b3b80d8
IndependentBlocks: clang-format and remove includes

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@177785 91177308-0d34-0410-b5e6-96231b3b80d8
Instvarsimplify: clang-format

Even though we will soon get rid of this pass, we reformat it on the way to
make polly clang-format clean.

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@177786 91177308-0d34-0410-b5e6-96231b3b80d8
RegisterPasses: clang-format

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@177787 91177308-0d34-0410-b5e6-96231b3b80d8