From: bors <bors@rust-lang.org>
Date: Mon, 16 Apr 2018 21:10:56 +0000 (+0000)
Subject: Auto merge of #5272 - Phlosioneer:5211-missing-size-hints, r=matklad
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Auto merge of #5272 - Phlosioneer:5211-missing-size-hints, r=matklad

Implement size_hint for some iterators

This PR implements size_hints for `Deps`, `DepsNotReplaced`, and `Members`.
These size_hints are used extensively by cargo to allocate Vecs.

`Deps`, `DepsNotReplaced`, and `RcVecIter` also now implement `ExactSizeIterator`.

Closes #5211
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de23b54b01324a9e17e04e1bbe6d69468904f348