When allocating new pages, add them to the end of the linked list

When we allocate new pages, allocate them on the end of the linked list.
Then when we compact we can move things to the head of the list

gc.c

@@ -1914,7 +1914,7 @@ heap_add_page(rb_objspace_t *objspace, rb_heap_t *heap, struct heap_page *page)
     /* Adding to eden heap during incremental sweeping is forbidden */
     GC_ASSERT(!(heap == heap_eden && heap->sweeping_page));
     page->flags.in_tomb = (heap == heap_tomb);
-    list_add(&heap->pages, &page->page_node);
+    list_add_tail(&heap->pages, &page->page_node);
     heap->total_pages++;
     heap->total_slots += page->total_slots;
 }
@@ -5036,7 +5036,7 @@ gc_sweep_step(rb_objspace_t *objspace, rb_heap_t *heap)
 
     do {
 	int free_slots = gc_page_sweep(objspace, heap, sweep_page);
-	heap->sweeping_page = list_next(&heap->pages, sweep_page, page_node);
+        heap->sweeping_page = list_next(&heap->pages, sweep_page, page_node);
 
 	if (sweep_page->final_slots + free_slots == sweep_page->total_slots &&
 	    heap_pages_freeable_pages > 0 &&