Simplify a benchmarking test function

[esantorella]

Summary: Simplify a function. I'm splitting off parts of D66313060 to make it easlier to review.

Differential Revision: D66398976

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D66398976

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.42%. Comparing base (7f2c4a0) to head (0859145).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3111 +/- ## ========================================== - Coverage 95.43% 95.42% -0.01% ========================================== Files 503 503 Lines 50264 50269 +5 ========================================== + Hits 47967 47970 +3 - Misses 2297 2299 +2 ```

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D66398976

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D66398976

[facebook-github-bot]

This pull request has been merged in facebook/Ax@e4cdeca5ca0eb8ea918e2e59cb5ec0ad506e9963.