common.mk: upgrade benchmark_driver to v0.14
benchmark/driver.rb: deal with breaking changes which are actually introduced for this driver.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63916 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
common.mk: upgrade benchmark_driver to v0.14
benchmark/driver.rb: deal with breaking changes which are actually
introduced for this driver.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63916 b2dd03c8-39d4-4d8f-98ff-823fe69b080e