Auto merge of #43964 - Gankro:unsafe-reform, r=sfackler

implement unsafe pointer methods

I also cleaned up some existing documentation a bit here or there since I was doing so much auditing of it. Most notably I significantly rewrote the `offset` docs to clarify safety (`*const` and `*mut`'s offset docs had actually diverged).
This commit is contained in:
bors 2017-09-16 19:54:58 +00:00
commit 277476c4fb

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