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c-variadic: add roundtrip test#155486

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folkertdev wants to merge 2 commits intorust-lang:mainfrom
folkertdev:c-variadic-roundtrip
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c-variadic: add roundtrip test#155486
folkertdev wants to merge 2 commits intorust-lang:mainfrom
folkertdev:c-variadic-roundtrip

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tracking issue: #44930

Test that our va_arg implementation matches (as in, can decode) how LLVM passes c-variadic arguments.

And some comment followup to #152980 (cc @RalfJung, feel free to review this PR too btw).

r? tgross35

@rustbot rustbot added A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Apr 18, 2026
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rustbot commented Apr 18, 2026

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A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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