[Issue 23409] ImportC: multiple usages of va_list produces garbage

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23409

--- Comment #3 from dave287091 at gmail.com ---
It works with ldc (which probably just defers to the llvm intrinsic) so the dmd
implementation of stdarg is wrong. This is not actually ImportC specific.

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