codegen.c: complete monolithic function refactoring

Extract final complex cases (NODE_OP_ASGN, NODE_MASGN), unify while/until
loop handling, apply early return pattern to reduce indentation, and achieve
complete switch statement consistency.

The original 5000+ line monolithic function is now organized into 60+ focused
functions while preserving all functionality and performance.

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Yukihiro "Matz" Matsumoto
2025-08-25 17:19:50 +09:00
parent c54d5abdaf
commit 1e178b0860
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