local_tbl region from getting freed many times; submitted by
  Chikanaga Tomoyuki <chikanag AT nippon-control-system.co.jp> in
  [ruby-dev:30460].

* eval.c (proc_invoke): Ditto.

* gc.c (obj_free): Ditto.

* parse.y (top_local_setup_gen): Ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_6@11965 b2dd03c8-39d4-4d8f-98ff-823fe69b080e