There seems to be an ongoing work for Vulcan Compute support for Tensorflow. But the mlir repo moved at the end of 2019 and I don't see where (or if) the discussion and PR continue, because the new repo doesn't even use Github Issues.

  https://github.com/tensorflow/mlir/issues/60
  https://github.com/tensorflow/mlir/pull/118
  https://github.com/tensorflow/mlir/