StaticAttentionIOManager: Fix out of bound errors on precomuted RoPE frequencies

[sxu]

Summary: The precomputed RoPE frequencies can run out despite the KV caches are circular buffers by default.

Differential Revision: D83361153

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14630

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❌ 1 New Failure, 2 Unrelated Failures

As of commit dab2eb0 with merge base 684b5fd ():

NEW FAILURE - The following job has failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 8d387c177d7b00fa30d5b3d0a3a5b9a0e9af342132460631129249bf32314854 /exec failed with exit code 1

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-binary-size-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-setup-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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@sxu has exported this pull request. If you are a Meta employee, you can view the originating diff in D83361153.