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c-variadic: add roundtrip test tracking issue: https://github.com/rust-lang/rust/issues/44930 Test that our `va_arg` implementation matches (as in, can decode) how LLVM passes c-variadic arguments. And some comment followup to https://github.com/rust-lang/rust/pull/152980 (cc @RalfJung, feel free to review this PR too btw). r? tgross35