Because of the laziness, the required passes must exist even after

LoopVR::runOnFunction runs.

This should accomplish that, but it doesn't. I think that's a PassManager bug,
but without a consumer of LoopVR in the tree, I can't give steps to reproduce.

llvm-svn: 52886

llvm/include/llvm/Analysis/LoopVR.h

@@ -37,8 +37,8 @@ public:
   void releaseMemory();
 
   void getAnalysisUsage(AnalysisUsage &AU) const {
-    AU.addRequired<LoopInfo>();
-    AU.addRequired<ScalarEvolution>();
+    AU.addRequiredTransitive<LoopInfo>();
+    AU.addRequiredTransitive<ScalarEvolution>();
     AU.setPreservesAll();
   }