Use struct SDep instead of std::pair for SUnit pred and succ lists. First step

in tracking physical register output dependencies.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42125 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp

@@ -264,7 +264,7 @@ namespace llvm {
     /// edge, override this method.
     template<typename EdgeIter>
     static std::string getEdgeAttributes(const void *Node, EdgeIter EI) {
-      if (EI.isChain())
+      if (EI.isCtrlDep())
         return "color=blue,style=dashed";
       return "";
     }