* gc.c (link_free_heap_slot): removed.
* gc.c (slot_sweep): use `heaps_add_freeslot' instead of
  `link_free_heap_slot'.
* gc.c (assign_heap_slot): use local variable `slot' instead of
  `heaps'.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42000 b2dd03c8-39d4-4d8f-98ff-823fe69b080e