todo: We now have OpenMP support in isl backend

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@222365 91177308-0d34-0410-b5e6-96231b3b80d8
todo: We can support modifiable memory access functions

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@222366 91177308-0d34-0410-b5e6-96231b3b80d8