do not use -polly-cloog in a ScopInfo testcase

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@192109 91177308-0d34-0410-b5e6-96231b3b80d8
use -polly-codegen-isl in tests under test/Isl

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@192110 91177308-0d34-0410-b5e6-96231b3b80d8