SCEV: Allow simple AddRec * Parameter products in delinearization

This patch also allows the -delinearize pass to delinearize expressions that do
not have an outermost SCEVAddRec expression. The SCEV::delinearize
infrastructure allowed this since r240952, but the -delinearize pass was not
updated yet.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@250018 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed