Summary:
Pull Request resolved: https://github.com/facebookresearch/faiss/pull/3981
prior issues:
1. Nightlies were breaking due to yaml changes. Those are reverted.
2. AIX build broke (external). Fix is to add a conditional in tests/CMakeLists.txt.
3. Build issue https://github.com/facebookresearch/faiss/issues/3944. Could not repro now.
Reviewed By: mdouze
Differential Revision: D64440629
fbshipit-source-id: a86b27c25ada0d07e9d3b4c6e4f00b2e6b637fbe