Fix a miscompilation in crafty due to a recent patch

llvm-svn: 24706
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index acd80cf..c7cc691 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -1582,7 +1582,7 @@
   // fold (zext (truncate x)) -> (zextinreg x) iff x size == zext size.
   if (N0.getOpcode() == ISD::TRUNCATE && N0.getOperand(0).getValueType() == VT&&
       !AfterLegalize)
-    return DAG.getZeroExtendInReg(N0.getOperand(0), VT);
+    return DAG.getZeroExtendInReg(N0.getOperand(0), N0.getValueType());
   // fold (zext (load x)) -> (zext (truncate (zextload x)))
   if (N0.getOpcode() == ISD::LOAD && N0.hasOneUse()) {
     SDOperand ExtLoad = DAG.getExtLoad(ISD::ZEXTLOAD, VT, N0.getOperand(0),