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b01cc1cf01
Move warning reporting from flag_to_backend_features to cfg_target_feature This way warnings are emitted even in a check build.
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.