Make classes and structures in core/loader fast-allocated.

Source/core/loader/ImageLoader.h

Index: Source/core/loader/ImageLoader.h
diff --git a/Source/core/loader/ImageLoader.h b/Source/core/loader/ImageLoader.h
index bdeeb8fe016c5e7d57d7b60402a409ee5a4a97ef..84678d1554079a851b738a99ca513791191861ac 100644
--- a/Source/core/loader/ImageLoader.h
+++ b/Source/core/loader/ImageLoader.h
@@ -60,6 +60,7 @@ typedef EventSender<ImageLoader> ImageEventSender;
 
 class CORE_EXPORT ImageLoader : public NoBaseWillBeGarbageCollectedFinalized<ImageLoader>, public ImageResourceClient {
     WILL_BE_USING_PRE_FINALIZER(ImageLoader, dispose);
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(ImageLoader);
 public:
     explicit ImageLoader(Element*);
     ~ImageLoader() override;