* common.mk (rdoc-bench): add a benchmark rule
  using RDoc. Generate all rdoc related files
  (same as `make rdoc') in temporary directory
  and remove them. Excecution time, GC::Profiler
  and results of GC.stat are printed.
* tool/rdocbench.rb: added for `rdoc-bench'.



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* properties.

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* remove trailing spaces.

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