Reapply the indvars patch, since nothing blew up last night.

llvm-svn: 29874
diff --git a/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp b/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp
index efa587b..a8d90ce 100644
--- a/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp
+++ b/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp
@@ -79,6 +79,7 @@
       AU.addRequired<ScalarEvolution>();
       AU.addRequired<LoopInfo>();
       AU.addPreservedID(LoopSimplifyID);
+      AU.addPreservedID(LCSSAID);
       AU.setPreservesCFG();
     }
   private: