8241068: Shenandoah: improve ShenandoahTraversalGC constructor arguments

Reviewed-by: shade

src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp

@@ -368,7 +368,7 @@ jint ShenandoahHeap::initialize() {
   }
 
   _traversal_gc = strcmp(ShenandoahGCMode, "traversal") == 0 ?
-                  new ShenandoahTraversalGC(this, _num_regions) :
+                  new ShenandoahTraversalGC(this) :
                   NULL;
 
   _control_thread = new ShenandoahControlThread();

src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp

@@ -291,7 +291,7 @@ class ShenandoahFinalTraversalCollectionTask : public AbstractGangTask {
   }
 };
 
-ShenandoahTraversalGC::ShenandoahTraversalGC(ShenandoahHeap* heap, size_t num_regions) :
+ShenandoahTraversalGC::ShenandoahTraversalGC(ShenandoahHeap* heap) :
   _heap(heap),
   _task_queues(new ShenandoahObjToScanQueueSet(heap->max_workers())),
   _traversal_set(ShenandoahHeapRegionSet()) {

src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.hpp

@@ -39,7 +39,7 @@ class ShenandoahTraversalGC : public CHeapObj<mtGC> {
   ShenandoahHeapRegionSet _traversal_set;
 
 public:
-  ShenandoahTraversalGC(ShenandoahHeap* heap, size_t num_regions);
+  ShenandoahTraversalGC(ShenandoahHeap* heap);
   ~ShenandoahTraversalGC();
 
   ShenandoahHeapRegionSet* traversal_set() { return &_traversal_set; }