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Partial fix for #15048 Inconsistent error severity for uninitvar #2085

Job	Run time
build (asan, -DANALYZE_ADDRESS=On, true, process, false)	14m 53s
build (ubsan, -DANALYZE_UNDEFINED=On, true, process, true)	33m 40s
build (tsan, -DANALYZE_THREAD=On, false, thread, false, --executor=thread --error-exitcode=0)	11m 48s
	1h 0m 21s