[DAG] Remove unused variable 'VT' in DAGCombiner.cpp (NFC)

/llvm-project/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:26896:7: error: unused variable 'VT' [-Werror,-Wunused-variable]
  EVT VT = N->getValueType(0);
      ^
1 error generated.

llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

@@ -26893,7 +26893,6 @@ SDValue DAGCombiner::foldSelectOfBinops(SDNode *N) {
   SDValue N0 = N->getOperand(0);
   SDValue N1 = N->getOperand(1);
   SDValue N2 = N->getOperand(2);
-  EVT VT = N->getValueType(0);
   SDLoc DL(N);
 
   unsigned BinOpc = N1.getOpcode();