Updating submodules
Summary:
GitHub commits:
https://github.com/hhvm/hsl/commit/efc34423b6b2870412f51da847571f586581e881
https://github.com/facebook/fbthrift/commit/75bb4596547b2f9daf33b8d6649a434e50109f59
https://github.com/facebook/litho/commit/fc1945c2e032dbdbac6ec1db02d782aa168a9b7b
https://github.com/facebookresearch/pytorch-biggraph/commit/332a31a1450b87e0aea5cc0906aea6f728d0d450
https://github.com/pytorch/fbgemm/commit/2b6eef4dc93c5f5cb9e41eb3779cbe21fcc89e1d
Test Plan: n/a
Reviewed By: 2d2d2d2d2d
fbshipit-source-id: d105b9aa5001c53f884f007406684b73809a7680
