XLA default optimisations - MLIR or Grappler in TF 2.11.x

What is used by default for XLA (Accelerated Linear Algebra) in TensorFlow 2.11.x Grappler or MLIR, and how can I switch between Grappler and MLIR for benchmarking.

XLA does not use either.

An XLA built by using MLIR is not completed yet, and XLA and Grappler are both used by Tensorflow, but they do not use each other.

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