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A lot of places had special handling just in case they would get an allocator module even though most of these places could never get one or would have a trivial implementation for the allocator module. Moving all handling of the allocator module to a single place simplifies things a fair bit.
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.