remoe sys call message

and rely on linux to restore all registers
save message in r8

lib/parfait/space.rb

@@ -25,7 +25,6 @@ module Parfait
       super()
       Parfait::Space.set_object_space self
       @classes = Parfait::Dictionary.new_object
-      @syscall_message = nil  # a hack sto store the message during syscall
     end
     attr_reader :classes , :first_message