Don't use delegate to delegate trivial methods

Around 300 ms (in total) would be spent in these delegated methods due
to the extra stuff ActiveSupport adds to the compiled methods. Because
these delegations are so simple we can just manually define the methods,
saving around 275 milliseconds.

lib/banzai/filter/abstract_reference_filter.rb

@@ -47,7 +47,17 @@ module Banzai
         { object_sym => LazyReference.new(object_class, node.attr(data_reference)) }
       end
 
-      delegate :object_class, :object_sym, :references_in, to: :class
+      def object_class
+        self.class.object_class
+      end
+
+      def object_sym
+        self.class.object_sym
+      end
+
+      def references_in(*args, &block)
+        self.class.references_in(*args, &block)
+      end
 
       def find_object(project, id)
         # Implement in child class