rework macro tests, or are they builtin

small fixes too

lib/mom/macro/exit.rb

@@ -3,7 +3,7 @@ module Mom
     def to_risc(compiler)
       builder = compiler.builder(compiler.source)
       builder.prepare_int_return # makes integer_tmp variable as return
-      Builtin.exit_sequence(builder)
+      Macro.exit_sequence(builder)
       return compiler
     end
   end