load constant to create register names with class

Just the id_ did give no clue to the contents, just took care of the uniqueness.
Better for debugging

lib/risc/instructions/load_constant.rb

@@ -45,7 +45,8 @@ module Risc
         type = constant.ct_type
         value = constant.value
       end
-      register = RegisterValue.new( "id_#{value.object_id}".to_sym , type )
+      value_class = value.class.name.to_s.split("::").last.downcase
+      register = RegisterValue.new( "id_#{value_class}_#{value.object_id}".to_sym , type )
     end
     LoadConstant.new( source , constant , register )
   end