rewrite scanForDeadObjects to avoid retire-without-drop (#9942) #2676

Job	Run time
snapshot	2s
docker-parallel-build (linux/amd64)	7m 52s
docker-parallel-build (linux/arm64/v8)	1h 56m 55s
docker-sdk	10s
docker-solo	1m 3s
docker-ibc-alpha	21s
	2h 6m 23s

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