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If a function was instrumented for coverage, but all of its coverage statements have been removed by later MIR transforms, it should be treated as "unused" even if the compiler generates an unreachable stub for it.
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.