Make sure this DAGCombine actually returns an UNDEF of the correct type; PR10476.

llvm-svn: 135993
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 5a7319f..51aca66 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -6896,7 +6896,7 @@
 
     // If Idx was -1 above, Elt is going to be -1, so just return undef.
     if (Elt == -1)
-      return DAG.getUNDEF(LN0->getBasePtr().getValueType());
+      return DAG.getUNDEF(LVT);
 
     unsigned Align = LN0->getAlignment();
     if (NewLoad) {