Issue 5141 - [emscripten] Convert filter matcher to C++

compiled/Map.h

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 72 matching lines @@
     explicit HashContainerReference(entry_type* entry)
         : mEntry(entry)
     {
     }
 
     const entry_type* operator->() const
     {
       return mEntry;
     }
 
+    entry_type* operator->()
+    {
+      return mEntry;
+    }
+
     operator bool() const
     {
       return !mEntry->is_invalid();
     }
   };
 
   template<typename Entry>
   class HashContainer
   {
   public:
@@ skipping 207 matching lines @@
   const_reference find(const key_type& key) const
   {
     return super::find(key);
   }
 
   reference find(const key_type& key)
   {
     return reference(this, key, super::find_bucket(key));
   }
 };