[resolved-env] Initialize entry for exports inside `initialize_env`
[resolved-env] Initialize entry for exports inside `initialize_env`

Summary:
Changelog: [internal]

This diff moves the code that initializes the loc env entry for exports from `infer_ast` to `initialize_env`.
This is necessary for fully resolved env, since type checking already begins in `initialize_env`

Reviewed By: mvitousek

Differential Revision: D36614052

fbshipit-source-id: 48a5dc6c21e00493b78604c081a586675a72b2e3

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