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In the LLVM-C API, boolean values are passed as `typedef int LLVMBool`, but our Rust-side typedef was using `c_uint` instead. Signed and unsigned integers have the same ABI on most platforms, but that isn't universally true, so we should prefer to be consistent with LLVM.
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.