events: performance regression in event benchmarks
See: https://github.com/nodejs/node/pull/12655#issuecomment-297187719
$ ./node benchmark/compare.js --old node --new ../main/node events > ~/eventsbench
[00:10:21|% 100| 7/7 files | 60/60 runs | 1/1 configs]: Done
james@ubuntu:~/node/node$cat ~/eventsbench | Rscript benchmark/compare.Rh
improvement confidence p.value
events/ee-add-remove.js n=250000 -45.73 % *** 8.380381e-18
events/ee-emit-multi-args.js n=2000000 0.70 % 2.285963e-01
events/ee-emit.js n=2000000 2.12 % *** 3.829377e-05
events/ee-listener-count-on-prototype.js n=50000000 -95.07 % *** 1.717885e-35
events/ee-listeners-many.js n=5000000 -20.60 % *** 8.616063e-14
events/ee-listeners.js n=5000000 -48.69 % *** 2.759171e-60
events/ee-once.js n=20000000 -58.16 % *** 3.019260e-56
I'm seeing a significant performance regression in the events benchmarks comparing master to 7.9.
/cc @mscdex
@mcollina
@nodejs/benchmarking