Function rustc_codegen_llvm::va_arg::emit_va_arg

pub(crate) fn emit_va_arg<'a, 'll, 'tcx>(
    bx: &mut Builder<'a, 'll, 'tcx>, 
    addr: OperandRef<'tcx, &'ll Value>, 
    target_ty: Ty<'tcx>
) -> &'ll Value