Convert KernelTable to a flat-indexed array rather than a hashtable. (#30332)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30332
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ghstack-source-id: 94481315
Reviewed By: resistor
Differential Revision: D18660421
fbshipit-source-id: 9f11434f1c3c234c45f586719182053fa81731f0
