event: improve performance of EventEmitter.emit

[mcollina]

This restore some performance we lost when we introduced primordialias.
Improvements are up to +100%.

Details

                                                     confidence improvement accuracy (*)   (**)  (***)
 events/ee-add-remove.js n=1000000                                   0.18 %       ±0.51% ±0.68% ±0.88%
 events/ee-emit.js listeners=1 argc=0 n=2000000             ***     43.53 %       ±1.04% ±1.40% ±1.84%
 events/ee-emit.js listeners=1 argc=10 n=2000000            ***     26.47 %       ±1.61% ±2.14% ±2.79%
 events/ee-emit.js listeners=1 argc=2 n=2000000             ***     22.94 %       ±1.02% ±1.38% ±1.82%
 events/ee-emit.js listeners=1 argc=4 n=2000000             ***     24.83 %       ±2.27% ±3.04% ±3.99%
 events/ee-emit.js listeners=10 argc=0 n=2000000            ***    111.71 %       ±1.43% ±1.91% ±2.50%
 events/ee-emit.js listeners=10 argc=10 n=2000000           ***     29.13 %       ±1.76% ±2.34% ±3.05%
 events/ee-emit.js listeners=10 argc=2 n=2000000            ***     27.52 %       ±1.60% ±2.13% ±2.78%
 events/ee-emit.js listeners=10 argc=4 n=2000000            ***     31.05 %       ±2.91% ±3.92% ±5.19%
 events/ee-emit.js listeners=5 argc=0 n=2000000             ***     73.72 %       ±0.98% ±1.31% ±1.72%
 events/ee-emit.js listeners=5 argc=10 n=2000000            ***     28.93 %       ±1.68% ±2.24% ±2.92%
 events/ee-emit.js listeners=5 argc=2 n=2000000             ***     28.53 %       ±1.71% ±2.30% ±3.03%
 events/ee-emit.js listeners=5 argc=4 n=2000000             ***     28.88 %       ±0.78% ±1.04% ±1.35%
 events/ee-listener-count-on-prototype.js n=50000000                 0.73 %       ±0.81% ±1.08% ±1.41%
 events/ee-listeners-many.js n=5000000                               0.52 %       ±1.13% ±1.51% ±1.96%
 events/ee-listeners.js n=5000000                                   -0.68 %       ±2.06% ±2.77% ±3.66%
 events/ee-once.js argc=0 n=20000000                        ***     14.97 %       ±3.18% ±4.23% ±5.51%
 events/ee-once.js argc=1 n=20000000                        ***      8.85 %       ±1.30% ±1.75% ±2.29%
 events/ee-once.js argc=4 n=20000000                        ***      8.55 %       ±1.10% ±1.47% ±1.91%
 events/ee-once.js argc=5 n=20000000                        ***      7.37 %       ±1.10% ±1.46% ±1.90

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• commit message follows commit guidelines