fix an infinite loop compiling ldecod, notice by JeffC.

llvm-svn: 35910
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index e373ef4..9ed09f2 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -2320,7 +2320,7 @@
     SDOperand SCC = 
       SimplifySelectCC(N0.getOperand(0), N0.getOperand(1),
                        DAG.getConstant(1, VT), DAG.getConstant(0, VT),
-                       cast<CondCodeSDNode>(N0.getOperand(2))->get());
+                       cast<CondCodeSDNode>(N0.getOperand(2))->get(), true);
     if (SCC.Val)
       return SCC;
   }