Updating submodules
Updating submodules

Summary:
GitHub commits:

https://github.com/facebook/folly/commit/cd8d2b0d20785f897111b949039d4cddaa843294
https://github.com/facebookincubator/velox/commit/b04c52f42f1e14de19165f3584d2773c2be5101b

Reviewed By: bigfootjon

fbshipit-source-id: 9f2dfa25136dcdc45fc804be63bba038b6dd28f4

facebook/watchman,nodakai/watchman,nodakai/watchman,facebook/watchman,facebook/watchman,nodakai/watchman,facebook/watchman,facebook/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,nodakai/watchman,nodakai/watchman,nodakai/watchman,facebook/watchman,facebook/watchman,nodakai/watchman,facebook/watchman