IO.foreach Increment Line Number

With JRUBY-1.5.0-DEV, no patches:
rj-lorimers-macbook-pro:bench rjlorimer$ ../bin/jruby --server bench_io_foreach.rb
                                    user system total real
IO.foreach(file) 15.171000 0.000000 15.171000 ( 15.107000)
                                    user system total real
IO.foreach(file) 13.667000 0.000000 13.667000 ( 13.667000)
                                    user system total real
IO.foreach(file) 13.144000 0.000000 13.144000 ( 13.144000)
                                    user system total real
IO.foreach(file) 14.110000 0.000000 14.110000 ( 14.110000)
                                    user system total real
IO.foreach(file) 14.630000 0.000000 14.630000 ( 14.630000)

With the latest patch for JRUBY-2810 and incrementLineno
rj-lorimers-macbook-pro:bench rjlorimer$ ../bin/jruby --server bench_io_foreach.rb
                                    user system total real
IO.foreach(file) 12.031000 0.000000 12.031000 ( 11.957000)
                                    user system total real
IO.foreach(file) 11.804000 0.000000 11.804000 ( 11.803000)
                                    user system total real
IO.foreach(file) 11.703000 0.000000 11.703000 ( 11.703000)
                                    user system total real
IO.foreach(file) 11.709000 0.000000 11.709000 ( 11.709000)
                                    user system total real
IO.foreach(file) 11.829000 0.000000 11.829000 ( 11.829000)

With the latest patch for JRUBY-2810 and incrementLineno removed:
rj-lorimers-macbook-pro:bench rjlorimer$ ../bin/jruby --server bench_io_foreach.rb
                                    user     system      total        real
IO.foreach(file)                9.069000   0.000000   9.069000 (  9.033000)
                                    user     system      total        real
IO.foreach(file)                8.344000   0.000000   8.344000 (  8.344000)
                                    user     system      total        real
IO.foreach(file)                8.346000   0.000000   8.346000 (  8.346000)
                                    user     system      total        real
IO.foreach(file)                8.422000   0.000000   8.422000 (  8.422000)
                                    user     system      total        real
IO.foreach(file)                8.390000   0.000000   8.390000 (  8.390000)

-- The 'bench_io_foreach_wide.rb' benchmark has no discernible difference removing incrementLineNo - it doesn't access the variable enough to make a difference.