perf(mangler): reduce unnecessary allocation

[Dunqing]

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[codspeed-hq]

CodSpeed Performance Report

Merging #4477 will not alter performance

_{Comparing perf-mangler-d (d4039be) with main (4d10c6c)}

Summary

✅ 32 untouched benchmarks

[overlookmotel]

@Dunqing Codspeed is not working properly (oxc-project/backlog#82). I'd suggest closing this PR and re-opening as a new PR so it correctly compares to latest main after Rust 1.80.0 upgrade. Right now it's hard to get an accurate read on benchmarks (NB Rust upgrade also affected minifier benchmarks).

[Dunqing]

@Dunqing Codspeed is not working properly (#4481). I'd suggest closing this PR and re-opening as a new PR so it correctly compares to latest main after Rust 1.80.0 upgrade. Right now it's hard to get an accurate read on benchmarks (NB Rust upgrade also affected minifier benchmarks).

Thanks for pointing this out!