8215756: Memory leaks in the AWT on macOS

Reviewed-by: shade, andrew

src/macosx/native/sun/awt/AWTView.m

 /*
- * Copyright (c) 2011, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -144,6 +144,11 @@ AWT_ASSERT_APPKIT_THREAD;
         fInputMethodLOCKABLE = NULL;
     }
 
+    if (rolloverTrackingArea != nil) {
+        [self removeTrackingArea:rolloverTrackingArea];
+        [rolloverTrackingArea release];
+        rolloverTrackingArea = nil;
+    }
 
     [super dealloc];
 }

src/macosx/native/sun/awt/AWTWindow.m

@@ -456,7 +456,7 @@ AWT_ASSERT_APPKIT_THREAD;
 
     JNIEnv *env = [ThreadUtilities getJNIEnvUncached];
     [self.javaPlatformWindow setJObject:nil withEnv:env];
-
+    self.javaPlatformWindow = nil;
     self.nsWindow = nil;
     self.ownerWindow = nil;
     [super dealloc];

src/macosx/native/sun/awt/CGraphicsEnv.m

@@ -203,7 +203,7 @@ JNF_COCOA_ENTER(env);
         return;
     }
 
-    [wrapper setJObject:NULL withEnv:env]; // more efficiant to pre-clear
+    [wrapper setJObject:NULL withEnv:env]; // more efficient to pre-clear
     [wrapper release];
 
 JNF_COCOA_EXIT(env);