[unroll] Merge the simplification and DCE estimation methods on the
UnrollAnalyzer.

Now they share a single worklist and have less implicit state between
them. There was no real benefit to separating these two things out.

I'm going to subsequently refactor things to share even more code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229062 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed