8320447: Remove obsolete LintCategory.hidden

Reviewed-by: jjg

Author: sormuras

src/jdk.compiler/share/classes/com/sun/tools/javac/code/Lint.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2005, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2023, 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
@@ -349,12 +349,7 @@ public enum LintCategory {
         RESTRICTED("restricted");
 
         LintCategory(String option) {
-            this(option, false);
-        }
-
-        LintCategory(String option, boolean hidden) {
             this.option = option;
-            this.hidden = hidden;
             map.put(option, this);
         }
 
@@ -363,7 +358,6 @@ static LintCategory get(String option) {
         }
 
         public final String option;
-        public final boolean hidden;
     }
 
     /**