fixes #23295; don't expand constants for complex structures #25438

Job	Run time
ubuntu-20.04 (batch: allowed_failures)	8m 2s
ubuntu-20.04 (batch: 0_3)	15m 22s
ubuntu-20.04 (batch: 1_3)	16m 31s
ubuntu-20.04 (batch: 2_3)	16m 14s
macos-12 (batch: allowed_failures)	17m 6s
macos-12 (batch: 0_3)	27m 7s
macos-12 (batch: 1_3)	29m 26s
macos-12 (batch: 2_3)	34m 47s
	2h 44m 35s

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