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0356908cf5
Adding an extra `OnceCell` to `CrateCoverageContext` is much nicer than trying to thread this string through multiple layers of function calls that already have access to the context.
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.