perf: code-splitting should not regenerate chunk

[JSerFeng]

Summary

Every time when iteratoring a block, there will be a new chunk created, though the chunk is not used, but it will stay in memory

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[SyMind]

!bench

[rspack-bot]

📝 Benchmark detail: Open

Name	Base (2024-06-11 34bb9ea)	Current	Change
10000_development-mode + exec	2.24 s ± 26 ms	2.23 s ± 26 ms	-0.29 %
10000_development-mode_hmr + exec	737 ms ± 14 ms	740 ms ± 7.2 ms	+0.40 %
10000_production-mode + exec	2.58 s ± 21 ms	2.59 s ± 29 ms	+0.24 %
arco-pro_development-mode + exec	1.92 s ± 78 ms	1.91 s ± 76 ms	-0.55 %
arco-pro_development-mode_hmr + exec	441 ms ± 1.3 ms	442 ms ± 2.5 ms	+0.12 %
arco-pro_production-mode + exec	3.51 s ± 71 ms	3.52 s ± 82 ms	+0.25 %
threejs_development-mode_10x + exec	1.41 s ± 15 ms	1.4 s ± 12 ms	-0.67 %
threejs_development-mode_10x_hmr + exec	802 ms ± 6.9 ms	807 ms ± 7.9 ms	+0.63 %
threejs_production-mode_10x + exec	4.71 s ± 20 ms	4.7 s ± 32 ms	-0.06 %