message: Static cast size_t to int in arguments 1,2 to forward_input_or_allocate_output()
  This fix resolves the following compiler error:
  tensorflow/core/kernels/mkl_relu_op.cc(1028): error C2398: Element '1':
  conversion from 'const std::size_t' to 'int' requires a narrowing conversion
diff: @@ -1023,7 +1023,8 @@ class MklReluGradOpBase : public OpKernel {
  }
  OP_REQUIRES_OK(context, context->forward_input_or_allocate_output(
  - {diff_dst_index}, diff_src_index,
  + {static_cast<const int>(diff_dst_index)},
  + static_cast<const int>(diff_src_index),
  tf_shape_diff_src, &diff_src_tensor));
  AllocateOutputSetMklShape(context, diff_src_index, dnn_shape_diff_src);
  