NFC: remove unused variable

D55768 removed its use.

llvm-svn: 349377

lib/CodeGen/SelectionDAG/TargetLowering.cpp

@@ -1976,7 +1976,6 @@ bool TargetLowering::SimplifyDemandedBitsForTargetNode(
           Op.getOpcode() == ISD::INTRINSIC_VOID) &&
          "Should use SimplifyDemandedBits if you don't know whether Op"
          " is a target node!");
-  EVT VT = Op.getValueType();
   computeKnownBitsForTargetNode(Op, Known, DemandedElts, TLO.DAG, Depth);
   return false;
 }