Fix #15007: `isAttributeNoreturn` not set for `_Noreturn` #1499

Job	Run time
build (ubsan, -DANALYZE_UNDEFINED=On, true, process, true)	45m 37s
build (asan, -DANALYZE_ADDRESS=On, true, process, false)	16m 24s
build (tsan, -DANALYZE_THREAD=On, false, thread, false, --executor=thread --error-exitcode=0)	11m 4s
	1h 13m 5s

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