Fix div10 without method_missing

but reanimate infer_type to auto create the needed regsiters
also some helpers

test/risc/test_builder2.rb

@@ -10,6 +10,12 @@ module Risc
       @compiler = Risc::MethodCompiler.new( method, SlotMachine::Label.new( "source_name", "return_label") )
       @builder  = @compiler.builder(method)
     end
+    def test_register_creation
+      assert_equal RegisterValue , @builder.register(:name).class
+    end
+    def test_register_creation_compiler
+      assert @builder.register(:name).compiler
+    end
     def test_list
       assert_equal :List , @builder.infer_type(:list).class_name
     end

test/slot_machine/macro/test_div10.rb

@@ -14,7 +14,7 @@ module SlotMachine
         assert_equal Risc::MethodCompiler , @method.to_risc.class
       end
       def test_risc_length
-        assert_equal 70 , @method.to_risc.risc_instructions.length
+        assert_equal 69 , @method.to_risc.risc_instructions.length
       end
     end
   end