ci(alloc): add formatter to just allocs

[overlookmotel]

Add formatter to just allocs (measure allocations).

[overlookmotel]

• perf(formatter): POC store AstNodes on stack instead of in arena #21931
• ci(alloc): add formatter to just allocs #21957 👈 (View in Graphite)
• main

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[Copilot]

Pull request overview

This PR extends the memory-allocation tracking task (cargo allocs / just allocs) to include oxc_formatter, so formatter allocations are captured alongside parser/semantic/transformer/minifier metrics.

Changes:

• Add oxc_formatter to the allocation tracking run, including a dedicated warm-up and measured pass.
• Generate and write a new snapshot file: allocs_formatter.snap.
• Add oxc_formatter as a dependency of tasks/track_memory_allocations.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
tasks/track_memory_allocations/src/lib.rs	Adds formatter warm-up + measurement by re-parsing with formatter-specific parse options and snapshotting results.
tasks/track_memory_allocations/allocs_formatter.snap	New snapshot capturing formatter allocation stats for the “complicated” fixture set.
tasks/track_memory_allocations/Cargo.toml	Adds oxc_formatter workspace dependency.
Cargo.lock	Records the new transitive dependency for the task crate.

[codspeed-hq]

Merging this PR will not alter performance

✅ 48 untouched benchmarks
⏩ 3 skipped benchmarks¹

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_{Comparing om/04-29-ci_alloc_add_formatter_to_just_allocs_ (807e625) with main (024c390)²}

Footnotes

1. 3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on main (c731a8b) during the generation of this report, so 024c390 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩