perf(transformer): nullish coalescing operator transform use SparseStack

[overlookmotel]

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[overlookmotel]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• perf(transformer): nullish coalescing operator transform use SparseStack #5942 👈
• fix(transformer): arrow function transform: prevent stack getting out of sync #5941
• perf(transformer): arrow function transform: reduce stack memory usage #5940
• perf(transformer): arrow function transform: calculate whether this is in arrow function lazily #5850
• fix(transformer): fix arrow function transform #5933
• test(transformer): add test for arrow function transform #5932
• main

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[codspeed-hq]

CodSpeed Performance Report

Merging #5942 will not alter performance

_{Comparing 09-21-perf_transformer_nullish_coalescing_operator_transform_use_sparsestack_ (c1c72fc) with 09-21-fix_transformer_arrow_function_transform_prevent_stack_getting_out_of_sync (fcf4d29)}

Summary

✅ 29 untouched benchmarks