move to parfait integers in risc layer

loading constants means loading parfait objects
objects have to me collected in machine
integer ok, string/true/false/nil next

lib/risc/method_compiler.rb

@@ -92,7 +92,7 @@ module Risc
 
     # for computationally building code (ie writing assembler) these short cuts
     # help to instantiate risc instructions and add them immediately
-    [:label, :reg_to_slot , :slot_to_reg , :load_constant, :load_data, 
+    [:label, :reg_to_slot , :slot_to_reg , :load_constant, :load_data,
       :function_return , :function_call,
       :transfer , :reg_to_slot , :byte_to_reg , :reg_to_byte].each do |method|
       define_method("add_#{method}".to_sym) do |*args|
@@ -132,5 +132,8 @@ module Risc
       @regs.clear
     end
 
+    def add_constant(const)
+      Risc.machine.add_constant(const)
+    end
   end
 end