refactor: lighten cfg stack burden

[EagleoutIce]

No description provided.

[Copilot]

Pull request overview

This PR refactors array operations to reduce stack/memory burden by replacing spread operators and array concatenations with explicit loops. The main goal is to avoid creating intermediate arrays during iteration and copying operations.

Key changes:

• Replaced spread operator patterns with nested loops to avoid intermediate array allocations
• Substituted spread syntax copying ([...array]) with Array.from() for explicit array copying
• Converted concat() operations with explicit loops where appropriate

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/dataflow/internal/process/functions/call/built-in/built-in-expression-list.ts	Replaced concat() in for-loop with nested loops to iterate over both processed.in and processed.unknownReferences
src/dataflow/internal/process/functions/call/built-in/built-in-assignment.ts	Refactored produceWrittenNodes to use explicit loops and manual object construction instead of spread operators and map
src/control-flow/extract-cfg.ts	Multiple refactorings replacing spread operators with nested loops, Array.from(), and .concat() calls; removed blank lines

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[EagleoutIce]

This pull request is included in v2.8.4 (see Release v2.8.4 (Extractor Instrumentation, Bugfixes, and Support for more Versions)).