[test] explicitly specify gather mode in roofline test

[jakevdp]

We are experimenting with changing the default mode for gather; this will make the test robust to that change.

[gemini-code-assist]

Summary of Changes

Hello @jakevdp, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the stability of a specific roofline test by hardcoding the gather operation's mode. This preemptive adjustment prevents potential test failures that could arise from changes to the default gather behavior, ensuring consistent and reliable test execution.

Highlights

• Test Robustness: The test_gather_batching_dims_roofline test now explicitly specifies the mode='promise_in_bounds' parameter for lax.gather. This change ensures the test remains robust and stable, even if the default gather mode is altered in future updates.

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[gemini-code-assist]

Code Review

This pull request makes the test_gather_batching_dims_roofline test more robust by explicitly specifying the mode for jax.lax.gather. This is a good change to prevent test failures if the default mode changes in the future. I have one minor suggestion for consistency.