* gc.c: rename gc related functions with prefix "gc_".
* before_gc_sweep() -> gc_before_sweep().
* after_gc_sweep()  -> gc_after_sweep().
* lazy_sweep()      -> gc_lazy_sweep().
* rest_sweep()      -> gc_rest_sweep().
* slot_sweep()      -> gc_slot_sweep().
* gc.c: rename a heap management function with prefix "heap_".
* get_freeobj() -> heap_get_freeobj().
* gc.c: rename markable_object_p() to is_markable_object().



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42030 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-07-18

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42031 b2dd03c8-39d4-4d8f-98ff-823fe69b080e