change return sequence to return messages to space

as it was before blocks
(thought blocks would make reuse of messages impossible, but was wrong, this only appilies to lambdas)
(too) many tests affected

lib/mom/instruction/return_sequence.rb

@@ -23,11 +23,13 @@ module Mom
       compiler.reset_regs
       builder = compiler.code_builder(self)
       builder.build do
-        #space << Parfait.object_space
-        #next_message << space[:next_message]
         object << message[:return_value]
         caller_reg << message[:caller]
         caller_reg[:return_value] << object
+        space << Parfait.object_space
+        next_message << space[:next_message]
+        message[:next_message] << next_message
+        space[:next_message] << message
       end
       compiler.reset_regs
       builder.build do