Constify SDNodeIterator an stop its only non-const user being cast stripped
of its constness. Found by gcc48 -Wcast-qual.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163254 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
index 618da52..3921635 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
@@ -49,7 +49,7 @@
 
     template<typename EdgeIter>
     static std::string getEdgeSourceLabel(const void *Node, EdgeIter I) {
-      return itostr(I - SDNodeIterator::begin((SDNode *) Node));
+      return itostr(I - SDNodeIterator::begin((const SDNode *) Node));
     }
 
     /// edgeTargetsEdgeSource - This method returns true if this outgoing edge