Fix #14468: Missing varid for nested struct members with designated i… #19544

Job	Run time
build_cmake (ubuntu:24.04, true, true)	2m 46s
build_cmake (alpine:3.23, false, false)	3m 38s
build_cmake (ubuntu:25.10, true, true)	2m 49s
build_make (ubuntu:25.10)	3m 33s
build_make (alpine:3.23)	5m 55s
build_make (ubuntu:24.04)	3m 3s
	21m 44s

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