Simplify the SCEVAffinator [NFC]


git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@222360 91177308-0d34-0410-b5e6-96231b3b80d8
Change states in the www/todo.html list


git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@222362 91177308-0d34-0410-b5e6-96231b3b80d8