message: Add checks in ReduceWindowOpOnTensorsConversion.
  The pattern does not support ops with non-zero padding config. Add a check to
  prevent unexpected lowering.
  It is not easy to add tests because other patterns will convert body ops, and
  it causes issues like invalid IRs.
diff: @@ -1712,6 +1712,10 @@ struct ReduceWindowOpOnTensorsConversion
  return rewriter.notifyMatchFailure(op, "expected NHWC pooling-based op");
  }
  + if (op.padding() && !isSplatValue(*op.padding(), 0)) {
  + return rewriter.notifyMatchFailure(op, "require paddings are all zero");
  + }
  +
  SmallVector<int64_t, 2> shapes;
  shapes.push_back(op.window_dimensions().getValue<int64_t>(1));
  shapes.push_back(op.window_dimensions().getValue<int64_t>(2));
  