* benchmark/gc/redblack.rb: import red black tree benchmark from
  https://github.com/jruby/rubybench/blob/master/time/bench_red_black.rb
* benchmark/gc/ring.rb: add a benchmark. This benchmark create many
  old objects.



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* properties.

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* remove trailing spaces.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41477 b2dd03c8-39d4-4d8f-98ff-823fe69b080e