Make method_call benchmark use inheritance.

This also fixes a bug where constructors weren't being bound
correctly, and eliminates some unneeded instructions when
compiling ifs.

I also tweaked the other method_call languages to match Wren's.
Since Wren needs to do a super call to get to the parent _count,
the other languages do now too.

This is nice too because it means we're benchmarking super 
calls.

benchmark/method_call.rb

@@ -29,7 +29,7 @@ class NthToggle < Toggle
     def activate
         @counter += 1
         if @counter >= @count_max
-            @bool = !@bool
+            super
             @counter = 0
         end
         self