Fix #14891 FP knownConditionTrueFalse (dereferencing pointer to array member) #20261

Job	Run time
build_cmake (alpine:3.23, false, false)	4m 0s
build_make (ubuntu:25.10)	3m 48s
build_cmake (ubuntu:24.04, true, true)	2m 50s
build_make (ubuntu:24.04)	4m 38s
build_make (alpine:3.23)	5m 59s
build_cmake (ubuntu:25.10, true, true)	3m 0s
	24m 15s

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