[12.x] Refactor the duplicate code by extracting it into a reusable method.

[abhihyder]

Summary

This PR refactors repetitive logic in the Illuminate\Routing\RouteCollection class related to populating the $nameList lookup array. Previously, both refreshNameLookups() and addLookups() contained duplicated code for checking and assigning named routes to the lookup table.

✅ Improvements included in this PR:

• Extracted name lookup logic into a dedicated addToNameLookup() method.
• refreshNameLookups() now delegates to the new helper method.
• Maintains existing behavior with zero breaking changes.
• Supports better readability, extensibility, and single-responsibility adherence.

Why?

This cleanup:

• Removes redundancy in the name lookup initialization logic.
• Makes route registration code more maintainable.
• Helps future customization or enhancements to named routing.

Before

Logic duplicated inside both:

• addLookups()
• refreshNameLookups()

After

Single clean implementation:

• addLookups() → calls addToNameLookup()
• refreshNameLookups() → calls addToNameLookup() during iteration
• Ensures consistent behavior

Tests

No functional modifications, so no new tests were required. All existing route tests already pass with these changes.