Precompute providers for each write loc
Precompute providers for each write loc

Summary: as title

Reviewed By: jbrown215

Differential Revision: D35478848

fbshipit-source-id: 13f76e74c8791bfb7c27b8791ba841ddb3865b97

facebook/flow,mroch/flow,facebook/flow,mroch/flow,facebook/flow,facebook/flow,facebook/flow,mroch/flow,facebook/flow,mroch/flow,mroch/flow,mroch/flow,facebook/flow,mroch/flow