Refs #12986: Tokenizer: don't simplify init list containing default-constructed element #740

Job	Run time
build (tsan, -DANALYZE_THREAD=On, false, thread, false, --executor=thread --error-exitcode=0)	11m 15s
build (asan, -DANALYZE_ADDRESS=On, true, process, false)	19m 19s
build (ubsan, -DANALYZE_UNDEFINED=On, true, process, true)	49m 30s
	1h 20m 4s

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