CVE-2022-23576: Integer overflow in Tensorflow

The implementation of OpLevelCostEstimator::CalculateOutputSize is vulnerable to an integer overflow if an attacker can create an operation which would involve tensors with large enough number of elements:

for (const auto& dim : output_shape.dim()) {
output_size *= dim.size();
}

Here, we can have a large enough number of dimensions in output_shape.dim() or just a small number of dimensions being large enough to cause an overflow in the multiplication.