[ownership] domain for borrowing
[ownership] domain for borrowing

Summary:
Enrich capability domain with borrowing info. Inline comments explain what the domain is doing.

The analyzer isn't actually using the borrowing functionality yet--that comes in the successor.

Reviewed By: jeremydubreil

Differential Revision: D7067942

fbshipit-source-id: 4c03c69

facebook/infer,jvillard/infer,facebook/infer,facebook/infer,facebook/infer,facebook/infer,jvillard/infer,jvillard/infer,facebook/infer,facebook/infer,jvillard/infer,jvillard/infer,jvillard/infer,jvillard/infer