pub fn lists(func: &mut Func, conv: &CallRegs)Expand description
Rewrites every va_arg, va_copy and va_end in the function, and leaves va_start alone.
Those three are the ones made only of reads and writes of a list some pointer already reaches,
so none of them needs to know anything about the frame and all three can be done here.
va_start is the one that does need the frame, and crate::lower has it.
A convention whose list is a plain pointer gets the walk the module doc’s last section describes instead, which is the same three rewrites over a list of one field.