Fix #14160 FP unreadVariable for smart pointer #19444

Job	Run time
build_make (alpine:3.23)	6m 11s
build_make (ubuntu:24.04)	3m 1s
build_cmake (ubuntu:25.10, true, true)	3m 0s
build_make (ubuntu:25.10)	3m 45s
build_cmake (alpine:3.23, false, false)	4m 2s
build_cmake (ubuntu:24.04, true, true)	2m 47s
	22m 46s

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