perf(minifier): avoid cloning Cow and allocating Atom

[overlookmotel]

Small optimization to minifier. Avoid cloning a Cow<str>, and don't allocate a new Atom when the string is already in arena.

[overlookmotel]

• perf(minifier): avoid cloning Cow and allocating Atom #10177 👈 (View in Graphite)
• main

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[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #10177 will degrade performances by 3.57%

_{Comparing 04-02-perf_minifier_avoid_cloning_cow_and_allocating_atom_ (0186383) with main (ec10d94)}

Summary

⚡ 1 improvements
❌ 1 regressions
✅ 34 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	formatter[antd.js]	7.6 ms	7.9 ms	-3.57%
⚡	formatter[typescript.js]	7.6 ms	7.2 ms	+5.56%

[Boshen]

Merge activity

• Apr 2, 4:16 AM EDT: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Apr 2, 4:16 AM EDT: Boshen added this pull request to the Graphite merge queue.
• Apr 2, 4:29 AM EDT: Merged by the Graphite merge queue.