Move ThreadLocalDebugInfo to c10 (#37774)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/37774
Move ThreadLocalDebugInfo from ATen to C10
Test Plan: Imported from OSS
Differential Revision: D21384249
Pulled By: ilia-cher
fbshipit-source-id: f9b5089a868f84a2ee013695a481fcc883d3c6b2
