Auto merge of #4984 - alexcrichton:configure-lto, r=matklad
authorbors <bors@rust-lang.org>
Wed, 31 Jan 2018 18:55:53 +0000 (18:55 +0000)
committerbors <bors@rust-lang.org>
Wed, 31 Jan 2018 18:55:53 +0000 (18:55 +0000)
Allow configuration of LTO in [profile]

This should help give access to ThinLTO when desired!


Trivial merge