Rename SDep's isSpecial to isArtificial, to make this field a little
less mysterious.

llvm-svn: 59782
diff --git a/llvm/lib/CodeGen/ScheduleDAGPrinter.cpp b/llvm/lib/CodeGen/ScheduleDAGPrinter.cpp
index b5d030c..2f0e662 100644
--- a/llvm/lib/CodeGen/ScheduleDAGPrinter.cpp
+++ b/llvm/lib/CodeGen/ScheduleDAGPrinter.cpp
@@ -50,7 +50,7 @@
     /// edge, override this method.
     template<typename EdgeIter>
     static std::string getEdgeAttributes(const void *Node, EdgeIter EI) {
-      if (EI.isSpecialDep())
+      if (EI.isArtificialDep())
         return "color=cyan,style=dashed";
       if (EI.isCtrlDep())
         return "color=blue,style=dashed";