Disable actor heap large chunk recycling (ponylang#4534)

The implementation of actor heap large chunk recycling from ponylang#4531
too naive and results in actors wasting huge amounts of time related
to large chunk recycling.

This commit effectively disables the large chunk recycling but
doesn't undo the code changes at the moment because the expectation
is that large chunk recycling will be re-enabled in the near future
with an improved implementation.

src/libponyrt/mem/heap.c

@@ -1066,6 +1066,11 @@ void ponyint_heap_endgc(heap_t* heap
   small_chunk_list(destroy_small, heap->small_recyclable, 0);
   large_chunk_list(destroy_large, heap->large_recyclable, 0);
 
+  // destroy all the potentially large recyclable chunks to effectively disabling
+  // large chunk recycling until it can be made smarterer
+  large_chunk_list(destroy_large, *to_recycle_large, 0);
+  *to_recycle_large = NULL;
+
   // save any chunks that can be recycled from this GC run
   // sort large chunks by the size of the chunks
   heap->large_recyclable = sort_large_chunk_list_by_size(*to_recycle_large);