Taught IRGen to support tensor-typed attributes with a scalar string as the value #21492
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string-tensor-typed attributes are usually to represent metadata like file names in a dataset TF op, so scalar tensor support should be sufficient.
Extending the code to also support string-tensors of arbitrary shapes would involve extending
createArrayAndSize()and the runtime functionswift_tfc_CreateScalarStringTensor(), which adds complexity without sufficient justification for now.Resolves SR-9555.