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734a5b1aa7
Unfortunately, multiple people are reporting linker warnings related to `__rust_no_alloc_shim_is_unstable` after this change. The solution isn't quite clear yet, let's revert to green for now, and try a reland with a determined solution for `__rust_no_alloc_shim_is_unstable`. This reverts commit c8b7f32434c0306db5c1b974ee43443746098a92, reversing changes made to 667247db71ea18c4130dd018d060e7f09d589490.
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.