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2b9e996b - Improve dynamo utils typing with TypeIs and TypeGuard (#154639)

Improve dynamo utils typing with TypeIs and TypeGuard (#154639) Summary: Adds some additional TypeIs and TypeGuard to some _dynamo utils for additional type narrowing X-link: https://github.com/pytorch/pytorch/pull/154639 Approved by: https://github.com/jansel Reviewed By: izaitsevfb Differential Revision: D75700408 fbshipit-source-id: 79a24709f645fe4acb79614989946ce00490b1a4