benches: add lower benches for stringview #12152
Merged
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Which issue does this PR close?
Follow up for #11855.
Rationale for this change
I updated the impl of upper and lower to support stringview, but didn't update the benchmarks to include stringview cases. This may be useful in the future if certain optimizations can be added.
It does add a number of new cases, so I can trim them if there's general concern about overall benchmark runtime.
What changes are included in this PR?
Just update the lower benches. I could also update the upper if it's good for completeness, but the lower and upper share 95% of their implementation.
Are these changes tested?
Yes, ran the benchmarks.