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3d671c0d54
cg_llvm: Pass `debuginfo_compression` through FFI as an enum There are only three possible values, making an enum more appropriate. This avoids string allocation on the Rust side, and avoids ad-hoc `!strcmp` to convert back to an enum on the C++ side.
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.