testrunner: do not use global check instances #530

Job	Run time
build (ubsan, -DANALYZE_UNDEFINED=On, true, process, true)	50m 3s
build (asan, -DANALYZE_ADDRESS=On, true, process, false)	16m 9s
build (tsan, -DANALYZE_THREAD=On, false, thread, false, --executor=thread --error-exitcode=0)	13m 48s
	1h 20m 0s

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