[Bug c/77590] va_arg() returns 0

[negge at dgql dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77590

--- Comment #1 from negge at dgql dot org ---
Created attachment 39620
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39620&action=edit
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