[Executorch] Add multithreading for op_quantize #15769
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Pull Request resolved: #15653 Without this fix when running diabled tets it fails with OMP: Error #131: Thread identifier invalid Differential Revision: [D86447540](https://our.internmc.facebook.com/intern/diff/D86447540/) ghstack-source-id: 322129665
Pull Request resolved: #15607 When doing prefill for quantized kv cache, with large prefill length, parallelizing this op helps. Differential Revision: [D84962234](https://our.internmc.facebook.com/intern/diff/D84962234/) **NOTE FOR REVIEWERS**: This PR has internal Meta-specific changes or comments, please review them on [Phabricator](https://our.internmc.facebook.com/intern/diff/D84962234/)! ghstack-source-id: 322129660
Pull Request resolved: #15608 Reason this doesnt directly use Vectorize class is because the equivalent APIs dont exist in Vectorize class Differential Revision: [D84962236](https://our.internmc.facebook.com/intern/diff/D84962236/) **NOTE FOR REVIEWERS**: This PR has internal Meta-specific changes or comments, please review them on [Phabricator](https://our.internmc.facebook.com/intern/diff/D84962236/)! ghstack-source-id: 322129666
Pull Request resolved: #15609 As the title Differential Revision: [D84962233](https://our.internmc.facebook.com/intern/diff/D84962233/) **NOTE FOR REVIEWERS**: This PR has internal Meta-specific changes or comments, please review them on [Phabricator](https://our.internmc.facebook.com/intern/diff/D84962233/)! ghstack-source-id: 322129661
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15769
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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: #15609 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/201/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/kimishpatel/201/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/kimishpatel/200/orig
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/kimishpatel/201/orig
Differential Revision: D84962233
@diff-train-skip-merge