Set the default bailout depth to 20 (#45710)
Summary:
This modifies the default bailout depth to 20 which gives us a reasonable performance in benchmarks we considered (fastrnns, maskrcnn, hub/benchmark, etc)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45710
Reviewed By: robieta
Differential Revision: D24071861
Pulled By: Krovatkin
fbshipit-source-id: 472aacc136f37297b21f577750c1d60683a6c81e
