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