Fix #14471: Improve check: shadowVariable for function argument #19217

Job	Run time
build_cmake (ubuntu:24.04, true, true)	5m 20s
build_make (ubuntu:25.10)	5m 9s
build_cmake (ubuntu:25.10, true, true)	5m 20s
build_cmake (alpine:3.23, false, false)	4m 42s
build_make (ubuntu:24.04)	4m 30s
build_make (alpine:3.23)	5m 59s
	31m 0s

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