JDK-8231447 : Shenandoah: Compilation-time regression after JDK-8231086
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It resolves the compilation-time problem. Apparently it is no good to have the clone barrier code exposed to everything that includes shenandoahBarrierSet.inline.hpp. Narrowing its inclusion to shenandoahBarrierSet.cpp and shenandoahRuntime.cpp gets us back to normal compilation times.