[Executorch] make slice_copy parallel#16125
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Pull Request resolved: #15830 When doing large prefills in LLMs, slice_copy takes about 5-10% time. Mainly coming from slicing in the rope implementation. ghstack-source-id: 327688163 Differential Revision: [D85532081](https://our.internmc.facebook.com/intern/diff/D85532081/)
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Pull Request resolved: pytorch#15830 When doing large prefills in LLMs, slice_copy takes about 5-10% time. Mainly coming from slicing in the rope implementation. ghstack-source-id: 327688163 Differential Revision: [D85532081](https://our.internmc.facebook.com/intern/diff/D85532081/)
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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: #15830 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/214/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/kimishpatel/214/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/main
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/kimishpatel/214/orig
Differential Revision: D85532081
@diff-train-skip-merge