refactor(transformer/nullish-coalescing): split main logic into separate function

[overlookmotel]

Small refactor. Move main logic of the transform into a separate function, to allow enter_expression to be inlined.

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[overlookmotel]

• refactor(transformer/nullish-coalescing): split main logic into separate function #7273 👈
• refactor(transformer/nullish-coalescing): avoid repeated symbol lookups #7272
• fix(transformer/nullish-coalescing): correct span #7269
• docs(transformer/nullish-coalescing): clarify doc comment #7268
• main

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[codspeed-hq]

CodSpeed Performance Report

Merging #7273 will not alter performance

_{Comparing 11-13-refactor_transformer_nullish-coalescing_split_main_logic_into_separate_function (9f5ae56) with main (01ddf37)}

Summary

✅ 30 untouched benchmarks

[Boshen]

Merge activity

• Nov 14, 11:16 AM EST: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Nov 14, 11:16 AM EST: A user added this pull request to the Graphite merge queue.
• Nov 14, 11:35 AM EST: A user merged this pull request with the Graphite merge queue.