perf(codegen): faster string ops POC

[overlookmotel]

POC only. Contains unsound code. Experiment into reading strings out of bounds for faster operations. Other stuff will break, but it's only codegen benchmark I'm interested in.

[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(codegen): faster string ops POC #20391 👈 (View in Graphite)
• perf(codegen): remove bounds checks POC #20381
• main

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[codspeed-hq]

Merging this PR will not alter performance

✅ 29 untouched benchmarks
⏩ 27 skipped benchmarks¹

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_{Comparing om/03-15-perf_codegen_faster_string_ops_poc (1948c2b) with om/03-14-perf_codegen_remove_bounds_checks_poc (cd9a424)}

Footnotes

1. 27 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. ↩