www: Use red for visited links

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@197745 91177308-0d34-0410-b5e6-96231b3b80d8
www: We already integrated the isl code generator

git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@197746 91177308-0d34-0410-b5e6-96231b3b80d8