From: bors <bors@rust-lang.org>
Date: Tue, 3 Apr 2018 22:50:12 +0000 (+0000)
Subject: Auto merge of #5287 - matklad:safer-intern, r=Eh2406
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Auto merge of #5287 - matklad:safer-intern, r=Eh2406

Slightly improve InternedString

* Use `&'static str` instead of (ptr, len) pair to reduce unsafety.
* try make hash calculation O(1) instead of O(n), fail miserably,
  document findings.
* Rename `to_inner` -> `as_str()`.
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9da0b7cdb82db61adecaad94f7b959e171704749