Fix #14725 FP redundantIfRemove when conditional code has extra code #20621

Job	Run time
build_make (alpine:3.23)	6m 14s
build_make (ubuntu:24.04)	3m 9s
build_cmake (ubuntu:25.10, true, true)	3m 3s
build_cmake (alpine:3.23, false, false)	4m 30s
build_make (ubuntu:25.10)	5m 33s
build_cmake (ubuntu:24.04, true, true)	3m 13s
	25m 42s

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