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30ec43a6c7
Primarily, this commit removes 2 fields from File, relying on the data being stored in the `files` field, with the key as the path digest, and the value as the struct decl corresponding to the File. This table is serialized into the compiler state that survives between incremental updates. Meanwhile, the File struct remains ephemeral data that can be reconstructed the first time it is needed by the compiler process, as well as operated on by independent worker threads. A key outcome of this commit is that there is now a stable index that can be used to refer to a File. This will be needed when serializing error messages to survive incremental compilation updates.