notable restructuring

tests/vcd-files/amaranth/up_counter.vcd

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+$comment Generated by Amaranth $end
+$date 2022-07-13 18:48:57.685239 $end
+$timescale 1 ps $end
+$scope module bench $end
+$scope module top $end
+$var wire 1 ! clk $end
+$var wire 1 " rst $end
+$var wire 1 # ovf $end
+$var wire 16 $ count $end
+$var string 1 % state $end
+$var wire 1 & en $end
+$upscope $end
+$upscope $end
+$enddefinitions $end
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