only issue `logChecker` messages when necessary (#8535) #450

Job	Run time
build (tsan, -DANALYZE_THREAD=On, false, thread, false, --executor=thread --error-exitcode=0)	14m 14s
build (ubsan, -DANALYZE_UNDEFINED=On, true, process, true)	51m 28s
build (asan, -DANALYZE_ADDRESS=On, true, process, false)	17m 41s
	1h 23m 23s

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