8235247: WorkerDataArray leaks C heap memory for associated work items

Reviewed-by: lkorinth, kbarrett

src/hotspot/share/gc/shared/workerDataArray.inline.hpp

@@ -59,6 +59,9 @@ T WorkerDataArray<T>::get(uint worker_i) const {
 
 template <typename T>
 WorkerDataArray<T>::~WorkerDataArray() {
+  for (uint i = 0; i < MaxThreadWorkItems; i++) {
+    delete _thread_work_items[i];
+  }
   FREE_C_HEAP_ARRAY(T, _data);
 }