change to_risc and builtin code according to last commit

Wherever space was loaded to get to the next_message
we now load the Message factory.
Otherwise much the same, only the attribute is next_object, not next_message
The binary is growing with 1k objects per factory, so i had to fix (hack) arm to handle bigger constants
close #14

lib/mom/instruction/message_setup.rb

@@ -63,12 +63,12 @@ module Mom
     # set the method into the message
     def build_message_data( builder )
       builder.build do
-        space? << Parfait.object_space
-        next_message? << space[:next_message]
+        factory? << Parfait.object_space.get_factory_for(:Message)
+        next_message? << factory[:next_object]
 
         #FIXME in a multithreaded future this should be done using lock free compare and swap.
         next_message_reg! << next_message[:next_message]
-        space[:next_message] << next_message_reg
+        factory[:next_object] << next_message_reg
 
         message[:next_message] << next_message
         next_message[:caller] << message

lib/mom/instruction/return_sequence.rb

@@ -26,10 +26,10 @@ module Mom
         object! << message[:return_value]
         caller_reg! << message[:caller]
         caller_reg[:return_value] << object
-        space! << Parfait.object_space
-        next_message! << space[:next_message]
+        factory? << Parfait.object_space.get_factory_for(:Message)
+        next_message! << factory[:next_object]
         message[:next_message] << next_message
-        space[:next_message] << message
+        factory[:next_object] << message
       end
       compiler.reset_regs
       builder.build do