[Executorch] Introduce caching cpu memory allocator#16120
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Pull Request resolved: #15611 Meant to use this for temp allocator for kernels. Specifically for sdpa, it seems that on iOS there is a significant overhead coming from allocations ghstack-source-id: 327518047 @exported-using-ghexport Differential Revision: [D85532079](https://our.internmc.facebook.com/intern/diff/D85532079/)
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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: pytorch#15611 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/203/base ghstack PR head: https://github.com/pytorch/executorch/tree/gh/kimishpatel/203/head Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/kimishpatel/202/orig Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/kimishpatel/203/orig Differential Revision: [D85532079](https://our.internmc.facebook.com/intern/diff/D85532079/) @diff-train-skip-merge Co-authored-by: Kimish Patel <kimishpatel@fb.com>
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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: #15611 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/203/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/kimishpatel/203/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/kimishpatel/202/orig
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/kimishpatel/203/orig
Differential Revision: D85532079
@diff-train-skip-merge