Perf result

perf result

MacBook-Pro-Skachkov-2:Webkit2 Developer$ Tools/Scripts/run-jsc-benchmarks after:/Users/Developer/Projects/Webkit2/WebKitBuild/af_opt_1/Release/jsc  before:/Users/Developer/Projects/Webkit2/WebKitBuild/before_opt_1/Release/jsc   --benchmarks='arrow' --warmup 2  --rerun 4
Warning: could not identify checkout location for after
Warning: could not identify checkout location for before
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Generating benchmark report at /Users/Developer/Projects/Webkit2/after_before_JSRegress_MacBook-Pro-Skachkov-2_20160223_0150_report.txt
And raw data at /Users/Developer/Projects/Webkit2/after_before_JSRegress_MacBook-Pro-Skachkov-2_20160223_0150.json

Benchmark report for JSRegress on MacBook-Pro-Skachkov-2 (MacBookPro8,1).

VMs tested:
"after" at /Users/Developer/Projects/Webkit2/WebKitBuild/af_opt_1/Release/jsc
"before" at /Users/Developer/Projects/Webkit2/WebKitBuild/before_opt_1/Release/jsc

Collected 4 samples per benchmark/VM, with 4 VM invocations per benchmark. Ran 4 benchmark iterations, and measured the
total time of those iterations, for each sample. Emitted a call to gc() between sample measurements. Used 8 benchmark
iterations per VM invocation for warm-up. Used the jsc-specific preciseTime() function to get microsecond-level timing.
Reporting benchmark execution times with 95% confidence intervals in milliseconds.

                                                   after                     before                                      

arrowfunction-call-in-class-constructor      394.7158+-21.0169    !    634.8511+-48.3616       ! definitely 1.6084x slower
arrowfunction-call-in-class-method           157.8157+-15.1707    !    301.9045+-19.2498       ! definitely 1.9130x slower
arrowfunction-call-in-function                41.9004+-3.7330     !    185.3675+-12.1667       ! definitely 4.4240x slower
arrowfunction-call                            56.3188+-5.7260     ?     57.9895+-4.0891        ? might be 1.0297x slower

<geometric>                                  110.0303+-5.6665     !    212.9248+-6.0661        ! definitely 1.9351x slower