[Executorch][quant] Optimize per channel dequantize#7139
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Pull Request resolved: #5670 When using quantized kv cache, dequantization routine takes significantly long. This diff just vectorizes dequant per channel for common case. ghstack-source-id: 255730818 @exported-using-ghexport Differential Revision: [D63338858](https://our.internmc.facebook.com/intern/diff/D63338858/)
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/7139
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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: #5670
^ 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/113/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/kimishpatel/113/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/main
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/kimishpatel/113/orig
@diff-train-skip-merge