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Cherry pick of #8551
In this PR, we introduce the means to print the protobuf of an HLO graph. This is helpful to debug hash-related issues with the caching that depends on the serialized proto. It will also add the flexibility to use the same hash to manipulate the hash (e.g. with pytorch/pytorch#144489). Once the flexibility to do so is merged on PyTorch, we can introduce this in our tests to test various applications of the cache in a single in-memory execution.
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