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This emits the same attributes we place on allocator declarations (and allocator definitions using `#[global_allocator]`) on the definitions in the allocator shim as well, making sure that the attributes are not lost if the allocator shim participates in LTO.
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.