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Remove `-Zkeep-hygiene-data`. It was added way back in #28585 under the name `-Zkeep-mtwt-tables`. The justification was: > This is so that the resolution results can be used after analysis, > potentially for tool support. There are no uses of significance in the code base, and various Google searches for both option names (and variants) found nothing of interest. I think this can safely be removed. r? `@davidtwco`