design/80645: add parallel throughput graphs

Change-Id: I7c5d03762e2536c939ba8e24082ed6456c6a46c1
Reviewed-on: https://go-review.googlesource.com/c/proposal/+/811920
Reviewed-by: Carlos Amedee <carlos@golang.org>
Auto-Submit: Carlos Amedee <carlos@golang.org>
diff --git a/design/80645/CounterParallel_value_float64_op_Add_par_multi_throughput.png b/design/80645/CounterParallel_value_float64_op_Add_par_multi_throughput.png
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diff --git a/design/80645/CounterParallel_value_uint64_op_Add_par_multi_throughput.png b/design/80645/CounterParallel_value_uint64_op_Add_par_multi_throughput.png
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