SL-20140 Optimization LLDictionary::addEntry() - avoid of double search

indra/llcommon/lldictionary.h

@@ -87,11 +87,10 @@ class LLDictionary : public std::map<Index, Entry *>
 	}
 	void addEntry(Index index, Entry *entry)
 	{
-		if (lookup(index))
+		if (!insert(value_type(index, entry)).second)
 		{
 			LL_ERRS() << "Dictionary entry already added (attempted to add duplicate entry)" << LL_ENDL;
 		}
-		(*this)[index] = entry;
 	}
 };