[Executorch][llm] Add ring buffer based kv cache and mask calculation to MHA #10833
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/10833
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… to MHA Pull Request resolved: #10609 Leveraging previous work now we allow MHA to have ring buffer cache. If ring buffer cache is used then we query the mask from kv cache and use that for sdpa instead of using precalculated mask. In this process we had to adjsut ring buffer implementation to allow keeping the context of full sliding window. See code for comment. ghstack-source-id: 283404675 @exported-using-ghexport Differential Revision: [D73891425](https://our.internmc.facebook.com/intern/diff/D73891425/)
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This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #10609 by @kimishpatel
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/kimishpatel/186/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/kimishpatel/186/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/kimishpatel/185/orig
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/kimishpatel/186/orig
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