Revert most of MaybeUninit, except for the new API itself#54554

Merged

bors merged 2 commits intorust-lang:masterfrom RalfJung:maybe-uninit

Sep 29, 2018

+85-254

Commits on Sep 29, 2018

Revert "Auto merge of rust-lang#53508 - japaric:maybe-uninit, r=RalfJung"
RalfJung
committed
add MaybeUninit

japaric
authored and
RalfJung
committed