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Using a helper trait allows the conversions to remain in `rustc_codegen_llvm`, even if the FFI types are moved to a different crate.
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.