PR #13372: [GPU] Fix autotuner_util_test.
PR #13372: [GPU] Fix autotuner_util_test.

Imported from GitHub PR https://github.com/openxla/xla/pull/13372


Copybara import of the project:

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99192a7119725e1b80153f8b29a229acb191c4f7 by Ilia Sergachev <isergachev@nvidia.com>:

[GPU] Fail on conflicting autotuning results.

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1af893eaf08a3904562f2d5ad633c4ac1843ce3f by Ilia Sergachev <isergachev@nvidia.com>:

[GPU] Fix autotuner_util_test.

Merging this change closes #13372

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/13372 from openxla:fix_autotuner_util_test 1af893eaf08a3904562f2d5ad633c4ac1843ce3f
