* gc.c: fix memory leak by prepend method.

  It is easy to reproduce with such script:
    module M; def bar; end; end
    loop{
      Class.new do
        def foo; end
        prepend M
      end
    }
* gc.c (obj_free): free T_ICLASS::m_tbl if it is created by prepend.
  To recognize it, check RICLASS_IS_ORIGIN flag.
* gc.c (gc_mark_children): T_ICLASS objects only need to mark
  T_ICLASS::m_tbl if RICLASS_IS_ORIGIN is set.
* gc.c (obj_memsize_of): count T_ICLASS if RICLASS_IS_ORIGIN is set.
* internal.h (RCLASS_SET_ORIGIN): add to set RCLASS_SET_ORIGIN.
  TODO: The word `origin' seems not good name. We need to invent
  another good name.
* class.c: use RCLASS_SET_ORIGIN().
* class.c (class_alloc): zero clear rb_classext_t.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49931 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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