Fix "Control reaches the end of non-void function" warnings, 
patch by David Chisnall.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48963 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 84d534d..80b5c04 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -808,6 +808,7 @@
     return DAG.getNode(ISD::BIT_CONVERT, ValueVT, Val);
 
   assert(0 && "Unknown mismatch!");
+  return SDOperand();
 }
 
 /// getCopyToParts - Create a series of nodes that contain the specified value