Fix formatting

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@222106 91177308-0d34-0410-b5e6-96231b3b80d8
Make usage of scev based code generation explicit in tests

This is in preparation of using SCEV based codegen by default in polly

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@222111 91177308-0d34-0410-b5e6-96231b3b80d8