refactor(transformer/arrow-functions): add TODO comments #25940

Job	Run time
Build Linter Benchmark	2m 37s
Benchmark (lexer)	1m 18s
Benchmark (parser)	1m 38s
Benchmark (transformer)	2m 2s
Benchmark (isolated_declarations)	2m 16s
Benchmark (semantic)	1m 41s
Benchmark (minifier)	2m 16s
Benchmark (codegen)	2m 3s
Benchmark linter (0)	3m 15s
Benchmark linter (1)	1m 37s
Upload benchmarks	19s
	21m 2s

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