feat(oxc_cfg): add implicit return instruction #22608

Job	Run time
Build Linter Benchmark	3m 15s
Benchmark (lexer)	1m 51s
Benchmark (parser)	1m 43s
Benchmark (transformer)	2m 12s
Benchmark (isolated_declarations)	1m 52s
Benchmark (semantic)	1m 44s
Benchmark (minifier)	2m 13s
Benchmark (codegen)	1m 29s
Benchmark (sourcemap)	1m 53s
Benchmark linter (0)	3m 3s
Benchmark linter (1)	1m 32s
Upload benchmarks	20s
	23m 7s

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