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Fix Inefficient GELU implementation in GPT2 #40059

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What does this PR do?

Fixes #39073 by using fused GELU instead of the custom implementation. This can improve the e2e efficiency by up to 12%.

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Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
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cc @ArthurZucker

… (uses NewGELUActivation) to gelu (uses GELUActivation)
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github-actions bot commented Aug 9, 2025

[For maintainers] Suggested jobs to run (before merge)

run-slow: gpt2

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Inefficient default GELU implementation in GPT2
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