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Update to ar_archive_writer 0.5 This updates `ar_archive_writer` to 0.5, which in turn was updated to match LLVM 20.1.8: <https://github.com/rust-lang/ar_archive_writer/pull/24> As part of this, I refactored part of `SymbolWrapper.cpp` to pull common code that I was about to duplicate again into a new function. NOTE: `ar_archive_writer` does include a breaking change where it no longer supports mangling C++ mangled names for Arm64EC. Since we don't need the mangled name (it's not the "exported name" which we're trying to load from the external dll), I'm setting the `import_name` when building for Arm64EC to prevent error when failing to mangle. r? `@bjorn3`
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.