worker: refactor to avoid unsafe array iteration

[aduh95]

No description provided.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/36100/
Benchmark CI: https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/946/

No perf regressions found.

                                                                       confidence improvement accuracy (*)   (**)  (***)
worker/atomics-wait.jsn=10000000                                                      -1.57 %       ±2.85% ±3.80% ±4.97%
worker/bench-eventlooputil.jsmethod='ELU_passed' n=1000000                            -0.53 %       ±1.82% ±2.42% ±3.15%
worker/bench-eventlooputil.jsmethod='ELU_simple' n=1000000                             0.05 %       ±2.41% ±3.21% ±4.20%
worker/echo.jsn=100000 sendsPerBroadcast=10 payload='object' workers=1                 2.83 %       ±4.91% ±6.54% ±8.51%
worker/echo.jsn=100000 sendsPerBroadcast=10 payload='string' workers=1                 0.41 %       ±4.96% ±6.60% ±8.60%
worker/echo.jsn=100000 sendsPerBroadcast=1 payload='object' workers=1                  2.81 %       ±3.48% ±4.63% ±6.03%
worker/echo.jsn=100000 sendsPerBroadcast=1 payload='string' workers=1                 -1.52 %       ±4.02% ±5.35% ±6.97%
worker/messageport.jsn=1000000 style='eventemitter' payload='object'                  -1.22 %       ±2.64% ±3.53% ±4.61%
worker/messageport.jsn=1000000 style='eventemitter' payload='string'                  -2.82 %       ±4.11% ±5.47% ±7.14%
worker/messageport.jsn=1000000 style='eventtarget' payload='object'                    1.90 %       ±4.03% ±5.38% ±7.04%
worker/messageport.jsn=1000000 style='eventtarget' payload='string'            **      5.21 %       ±3.24% ±4.32% ±5.64%

Be aware that when doing many comparisons the risk of a false-positive
result increases. In this case, there are 11 comparisons, you can thus
expect the following amount of false-positive results:
  0.55 false positives, when considering a   5% risk acceptance (*, **, ***),
  0.11 false positives, when considering a   1% risk acceptance (**, ***),
  0.01 false positives, when considering a 0.1% risk acceptance (***)

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/36108/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/36115/

[aduh95]

Landed in 0f29587