vm: refactor to avoid unsafe array iteration

[aduh95]

Checklist

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

[aduh95]

Benchmark CI: https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/869/ (queued, will 404 until it starts)

[aduh95]

No perf regression or improvement

Details

 confidence improvement accuracy (*) (**) (***)
vm/create-context.js n=100 -1.06 % ±8.00% ±10.65% ±13.88%
vm/run-in-context.js withSigintListener=0 breakOnSigint=0 n=1 -1.67 % ±7.09% ±9.43% ±12.27%
vm/run-in-context.js withSigintListener=0 breakOnSigint=1 n=1 2.73 % ±7.58% ±10.11% ±13.21%
vm/run-in-context.js withSigintListener=1 breakOnSigint=0 n=1 1.23 % ±6.48% ±8.65% ±11.31%
vm/run-in-context.js withSigintListener=1 breakOnSigint=1 n=1 -2.97 % ±4.42% ±5.89% ±7.66%
vm/run-in-this-context.js withSigintListener=0 breakOnSigint=0 n=1 -2.35 % ±5.64% ±7.50% ±9.77%
vm/run-in-this-context.js withSigintListener=0 breakOnSigint=1 n=1 5.30 % ±6.35% ±8.48% ±11.10%
vm/run-in-this-context.js withSigintListener=1 breakOnSigint=0 n=1 1.00 % ±5.77% ±7.69% ±10.03%
vm/run-in-this-context.js withSigintListener=1 breakOnSigint=1 n=1 -3.33 % ±4.76% ±6.33% ±8.24%
Be aware that when doing many comparisons the risk of a false-positive
result increases. In this case there are 9 comparisons, you can thus
expect the following amount of false-positive results:
0.45 false positives, when considering a 5% risk acceptance (*, **, ***),
0.09 false positives, when considering a 1% risk acceptance (**, ***),
0.01 false positives, when considering a 0.1% risk acceptance (***)
++ mv output030121-121422.csv /w/bnch-comp

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/35486/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/35496/

[aduh95]

Landed in e70e793