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[perf] Avoid nested traversals in ByRefNodeVisitor by tracking by-ref variable names per FunctionLike #35360

Job	Run time
Composer Validate	18s
Run with Space in Directory	21s
PHPStan	37s
Commented Code	15s
Compatible PHPStan versions	16s
Fixture Checks	23s
Avoid duplicate short class names	20s
Composer-based trigger packages are up to date	18s
Validate rule definitions	19s
PHP Linter	32s
Active Classes	22s
Finalize classes	37s
Preload php-parser Order	18s
Help and Version	21s
	5m 17s