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LLVM uses the word "code" to refer to a particular kind of coverage mapping. This unrelated usage of the word is confusing, and makes it harder to introduce types whose names correspond to the LLVM classification of coverage kinds.
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.