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cg_llvm: Replace some DIBuilder wrappers with LLVM-C API bindings (part 3) - Part of rust-lang/rust#134001 - Follow-up to rust-lang/rust#136375 - Follow-up to rust-lang/rust#136632 --- This is another batch of LLVMDIBuilder binding migrations, replacing some our own LLVMRust bindings with bindings to upstream LLVM-C APIs. This PR migrates all of the bindings that were touched by rust-lang/rust#136632, plus `LLVMDIBuilderCreateStructType`.
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.