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c-variadic: gate `va_arg` on `c_variadic_experimental_arch` tracking issue: https://github.com/rust-lang/rust/issues/44930 Just gating `...` is insufficient because we make the types available everywhere, and you could still define and export functions that used va_arg for targets where we don't want to stably support it. r? joshtriplett
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.