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Update ar_archive_writer to 0.2.0 This adds a whole bunch of tests checking for any difference with llvm's archive writer. It also fixes two mistakes in the porting from C++ to Rust. The first one causes a divergence for Mach-O archives which may or may not be harmless. The second will definitively cause issues, but only applies to thin archives, which rustc currently doesn't create.
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.