The index stored in the RegDefIter is one after the current index. When...

The index stored in the RegDefIter is one after the current index.  When getting the index, decrement it so that it points to the current element.  Fixes an off-by-one bug encountered when trying to make use of MVT::untyped.

llvm-svn: 133923

llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.h

@@ -140,7 +140,7 @@ namespace llvm {
       }
 
       unsigned GetIdx() const {
-        return DefIdx;
+        return DefIdx-1;
       }
 
       void Advance();