Some dead codes were introduced recently, primarily in shenandoahFreeSet.cpp file, e.g. https://github.com/openjdk/jdk/blob/aff25f135af20ec89c7a68f2a0a0ede7eb1491a6/src/hotspot/share/gc/shenandoah/shenandoahFreeSet.cpp#L1846-L1925

There might be some other places, will take the chance to clean up.