adjust add_to_mem to the new pop_pc model #473

Job	Run time
ci / Build	3m 19s
ci / Lint	1m 58s
ci / Test (0)	1m 37s
ci / Typecheck	1m 8s
ci / Test (1)	2m 42s
ci / Test (2)	1m 54s
ci / Test (3)	1m 6s
ci / Test (4)	2m 15s
ci / Test (5)	2m 45s
ci / Test (6)	2m 14s
ci / Test (7)	2m 1s
ci / Test (8)	1m 34s
ci / Test (9)	5m 55s
ci / Publish Unit Tests Results	1s
	30m 29s

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