fix some pesty errors

need to fix instruction overlap beofre interpreter starts again

lib/arm/instructions/call_instruction.rb

@@ -52,7 +52,8 @@ module Arm
         # But, for methods, this happens to be the size of the object header,
         # so there it balances out, but not blocks
         # have to use the code, not the method object for methods
-        arg = Risc::Position.get(@first) - Risc::Position.get(self)
+        f_pos = Risc::Position.get(@first)
+        arg =  f_pos - Risc::Position.get(self)
       else
         arg = @first
       end

lib/risc/position/position_listener.rb

@@ -24,7 +24,7 @@ module Risc
       me = previous.at + add
       object_pos = Position.get(@object)
       return if me == object_pos.at
-      Position.set(@object , me)
+      Position.set_to(@object , me)
     end
   end
 end