Fix #11439 FP returnDanglingLifetime for assignment to global var (#8… #20722

Job	Run time
build_cmake (ubuntu:24.04, true, true)	2m 35s
build_make (ubuntu:24.04)	3m 49s
build_cmake (alpine:3.23, false, false)	4m 46s
build_make (ubuntu:25.10)	3m 51s
build_cmake (ubuntu:25.10, true, true)	5m 36s
build_make (alpine:3.23)	6m 25s
	27m 2s

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