add a missing node name

llvm-svn: 25327
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 0936cce..12c909e 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -1899,6 +1899,7 @@
   case ISD::CopyToReg:     return "CopyToReg";
   case ISD::CopyFromReg:   return "CopyFromReg";
   case ISD::UNDEF:         return "undef";
+  case ISD::MERGE_VALUES:  return "mergevalues";
 
   // Unary operators
   case ISD::FABS:   return "fabs";