Added a hook to print out names of target specific DAG nodes.

llvm-svn: 24877
diff --git a/llvm/lib/Target/TargetLowering.cpp b/llvm/lib/Target/TargetLowering.cpp
index 415084e..8e9524e 100644
--- a/llvm/lib/Target/TargetLowering.cpp
+++ b/llvm/lib/Target/TargetLowering.cpp
@@ -122,3 +122,6 @@
   TransformToType[MVT::f64] = MVT::f64;
 }
 
+const char *TargetLowering::getTargetNodeName(unsigned Opcode) const {
+  return NULL;
+}