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emit_aapcs_va_arg() emits hardcoded field indexes to access the aarch64-specific `VaListImpl` struct. Due to the removed padding those indexes have changed.
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.