avoid using temporary objects in `followAllReferences()` #16239

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Run time

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Job	Run time
build (windows-2019, debug)	8m 14s
build (windows-2019, release)	8m 35s
build_qt (windows-2019, 5.15.2)	2m 44s
build (windows-2022, debug)	8m 32s
build_qt (windows-2019, 6.7.0)	2m 58s
build_qt (windows-2022, 5.15.2)	2m 34s
build (windows-2022, release)	6m 46s
build_qt (windows-2022, 6.7.0)	1m 16s
	41m 39s