Fix typo. Should check both values of RangeUse for 0. Patch by Marius…

… Wachtler.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79649 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp

@@ -2522,7 +2522,7 @@ void SelectionDAGLowering::visitShuffleVector(User &I) {
       }
     }
 
-    if (RangeUse[0] == 0 && RangeUse[0] == 0) {
+    if (RangeUse[0] == 0 && RangeUse[1] == 0) {
       setValue(&I, DAG.getUNDEF(VT));  // Vectors are not used.
       return;
     }