`c_variadic`: make `VaList` abi-compatible with C#141980

Merged

bors merged 4 commits intorust-lang:mainfrom

beetrees:va-list-proposal

Dec 6, 2025

Commits on Dec 4, 2025

Rework `c_variadic`

beetrees
authored and
folkertdev
committed
document `VaList` ABI for more targets
folkertdev
committed
split out `va_list` forwarding into its own test
folkertdev
committed

Commits on Dec 5, 2025

only run `pass-by-value-abi` on 64-bit windows
Folkert de Vries
committed