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We already had a dedicated `LocalFileId` index type, but previously we used a raw `u32` for global file IDs, because index types were harder to pass through FFI.
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.