Fix #15040 FN stlcstrConcat with compound assignment #20882

Job	Run time
build_make (ubuntu:25.10)	2m 53s
build_make (ubuntu:24.04)	3m 51s
build_cmake (ubuntu:25.10, true, true)	3m 12s
build_cmake (alpine:3.23, false, false)	3m 24s
build_cmake (ubuntu:24.04, true, true)	3m 28s
build_make (alpine:3.23)	6m 42s
	23m 30s

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