Fix #14860 FP sizeofwithsilentarraypointer with std::array #20072

Job	Run time
build_cmake (alpine:3.23, false, false)	4m 7s
build_cmake (ubuntu:24.04, true, true)	2m 47s
build_cmake (ubuntu:25.10, true, true)	2m 31s
build_make (ubuntu:25.10)	4m 56s
build_make (ubuntu:24.04)	2m 53s
build_make (alpine:3.23)	5m 3s
	22m 17s

Provide feedback