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merge revision(s) 43994,44000: [Backport #9205]

    * gc.c (finalize_deferred): flush all deferred finalizers while other
      finalizers can get ready to run newly by lazy sweep.
      [ruby-core:58833] [Bug #9205]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@44764 b2dd03c8-39d4-4d8f-98ff-823fe69b080e