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9028c93f - LazyVT utils to get original value/source and is_hashable (#144160)

LazyVT utils to get original value/source and is_hashable (#144160) Summary: X-link: https://github.com/pytorch/pytorch/pull/144160 Approved by: https://github.com/williamwen42, https://github.com/jansel ghstack dependencies: #144129, #144130, #144141, #144158, #144163 Reviewed By: jeanschmidt Differential Revision: D67828360 Pulled By: anijain2305 fbshipit-source-id: 60a4daa9e4bd04b9be7a4c3dd4551ea5e13aac86