Commits on Dec 14, 2019

1. Restore original implementation of Vec::retain …

   This PR reverts rust-lang#48065, which aimed to optimize `Vec::retain` by
   making use of `Vec::drain_filter`. Unfortunately at that time,
   `drain_filter` was unsound.
   
   The soundness hole in `Vec::drain_filter` was fixed in rust-lang#61224 by
   guaranteeing that cleanup logic runs via a nested `Drop`, even in
   the event of a panic. Implementing this nested drop affects codegen
   (apparently?) and results in slower code.
   
   Fixes rust-lang#65970

   

   aloucks committed Dec 14, 2019
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