extract padding functions to module

and finally TEST them
its especially the brain bending stuff that needs tests

lib/virtual/compiled_method_info.rb

@@ -140,12 +140,6 @@ module Virtual
       padded(l)
     end
 
-    def padded len
-      a = 32 * (1 + (len + 7)/32 )
-      #puts "#{a} for #{len}"
-      a
-    end
-
     # position of the function is the position of the entry block, is where we call
     def set_position at
       at += 8 #for the 2 header words