Fix 15042: ValueFlow: conditionally reassigned value should not be known #21006

Job	Run time
build_cmake (ubuntu:24.04, true, true)	5m 5s
build_make (ubuntu:25.10)	5m 9s
build_make (ubuntu:24.04)	4m 37s
build_cmake (alpine:3.23, false, false)	3m 31s
build_cmake (ubuntu:25.10, true, true)	4m 54s
build_make (alpine:3.23)	6m 46s
	30m 2s

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