title: How to get Scalar Evolution analysis in a LLVM LoopPass?
body: <p>I need to get hold of <code>ScalarEvolution</code> object inside LLVM loop pass. I know that we can get it from
  <code>LoopStandardAnalysisResults</code> object while using new pass manager. Is it possible to get the scalarEvolution analysis using old / legacy loop pass ?</p>