Fix #14860 FP sizeofwithsilentarraypointer with std::array (#8661) #20112

Job	Run time
build_make (alpine:3.23)	5m 45s
build_cmake (ubuntu:24.04, true, true)	2m 42s
build_make (ubuntu:24.04)	2m 51s
build_cmake (ubuntu:25.10, true, true)	2m 33s
build_cmake (alpine:3.23, false, false)	4m 25s
build_make (ubuntu:25.10)	2m 52s
	21m 8s

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