Commits on Jan 23, 2018

1. rustc: Add -C lto=val option …

   This commit primarily adds the ability to control what kind of LTO happens when
   rustc performs LTO, namely allowing values to be specified to the `-C lto`
   option, such as `-C lto=thin` and `-C lto=fat`. (where "fat" is the previous
   kind of LTO, throw everything in one giant module)
   
   Along the way this also refactors a number of fields which store information
   about whether LTO/ThinLTO are enabled to unify them all into one field through
   which everything is dispatched, hopefully removing a number of special cases
   throughout.
   
   This is intended to help mitigate rust-lang#47409 but will require a backport as well,
   and this would unfortunately need to be an otherwise insta-stable option.

   

   alexcrichton committed Jan 23, 2018
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