Implement size_hint on various sys iterators#49552

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Phlosioneer wants to merge 2 commits intorust-lang:masterfrom

Phlosioneer:libstd-sys-size-hints

Commits on Apr 1, 2018

Implement size_hint on various sys iterators
Phlosioneer
committed

Commits on Apr 25, 2018

Fix reference error
Phlosioneer
committed