Fix #14546 FN uninitMemberVar (in-class initializers but no construct… #19577

Job	Run time
build_cmake (ubuntu:25.10, true, true)	5m 24s
build_make (alpine:3.23)	5m 56s
build_cmake (alpine:3.23, false, false)	4m 26s
build_make (ubuntu:24.04)	4m 23s
build_make (ubuntu:25.10)	4m 50s
build_cmake (ubuntu:24.04, true, true)	5m 23s
	30m 22s

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