8220503: Move ShenandoahTerminatorTerminator::should_exit_termination out of header

Reviewed-by: rkennke

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

@@ -88,3 +88,7 @@ void ShenandoahObjToScanQueueSet::reset_taskqueue_stats() {
   }
 }
 #endif // TASKQUEUE_STATS
+
+bool ShenandoahTerminatorTerminator::should_exit_termination() {
+  return _heap->cancelled_gc();
+}

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

@@ -335,8 +335,7 @@ private:
   ShenandoahHeap* _heap;
 public:
   ShenandoahTerminatorTerminator(ShenandoahHeap* const heap) : _heap(heap) { }
-  // return true, terminates immediately, even if there's remaining work left
-  virtual bool should_exit_termination() { return _heap->cancelled_gc(); }
+  virtual bool should_exit_termination();
 };
 
 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHTASKQUEUE_HPP