Fix loading banner stuck after a reload

Author: alanjhughes

packages/react-native/React/CoreModules/RCTDevLoadingView.mm

@@ -51,10 +51,27 @@ - (instancetype)init
                                              selector:@selector(hide)
                                                  name:RCTJavaScriptDidFailToLoadNotification
                                                object:nil];
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                             selector:@selector(hide)
+                                                 name:@"RCTInstanceDidLoadBundle"
+                                               object:nil];
   }
   return self;
 }
 
+- (void)dealloc
+{
+  [self clearInitialMessageDelay];
+  [[NSNotificationCenter defaultCenter] removeObserver:self];
+  UIWindow *window = _window;
+  _window = nil;
+  if (window) {
+    RCTExecuteOnMainQueue(^{
+      window.hidden = YES;
+    });
+  }
+}
+
 + (void)setEnabled:(BOOL)enabled
 {
   RCTDevLoadingViewSetEnabled(enabled);