Fabric: Releasing image bitmap as part of `prepareForRecycle`

Summary:
@public
When some `RCTImageComponentView` is going to be recycled, it makes sense to free an associated bitmap because it will not be reused anyways.

Reviewed By: mdvacca

Differential Revision: D8601751

fbshipit-source-id: 1318622b66460b8e5588a4420c91c516fe2b1106

React/Fabric/Mounting/ComponentViews/Image/RCTImageComponentView.mm

@@ -39,6 +39,8 @@ using namespace facebook::react;
   return self;
 }
 
+#pragma mark - RCTComponentViewProtocol
+
 - (void)updateProps:(SharedProps)props oldProps:(SharedProps)oldProps
 {
   if (!oldProps) {
@@ -79,6 +81,14 @@ using namespace facebook::react;
   });
 }
 
+- (void)prepareForRecycle
+{
+  [super prepareForRecycle];
+  _imageView.image = nil;
+}
+
+#pragma mark - Other
+
 - (void)setImage:(UIImage *)image
 {
   const auto &imageProps = *std::static_pointer_cast<const ImageProps>(_props);