8327522: Shenandoah: Remove unused references to satb_mark_queue_active_offset

[linade]

Removed an unused variable (trivial)

Also, there is another place that uses satb_mark_queue_active_offset which is ShenandoahBarrierSetC2::verify_gc_barriers
The current barrier pattern is different from what this code is expecting:
If->Bool->CmpI->AndI->LoadUB->AddP->ConL(gc_state_offset)
rather than
If->Bool->CmpI->LoadB->AddP->ConL(marking_offset)
However, this code isn't doing as much checking as its counterpart in G1 anyway (so I'm thinking removing the incorrect matching code altogether?) Looking forward to your suggestions.

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• JDK-8327522: Shenandoah: Remove unused references to satb_mark_queue_active_offset (Enhancement - P4)

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