Commits on Jan 4, 2017

1. rustbuild: Quickly dist cross-host compilers …

   This commit optimizes the compile time for creating tarballs of cross-host
   compilers and as a proof of concept adds two to the standard Travis matrix. Much
   of this commit is further refactoring and refining of the `step.rs` definitions
   along with the interpretation of `--target` and `--host` flags. This has gotten
   confusing enough that I've also added a small test suite to
   `src/bootstrap/step.rs` to ensure what we're doing works and doesn't regress.
   
   After this commit when you execute:
   
       ./x.py dist --host $MY_HOST --target $MY_HOST
   
   the build system will compile two compilers. The first is for the build platform
   and the second is for the host platform. This second compiler is then packaged
   up and placed into `build/dist` and is ready to go. With a fully cached LLVM and
   docker image I was able to create a cross-host compiler in around 20 minutes
   locally.
   
   Eventually we plan to add a whole litany of cross-host entries to the Travis
   matrix, but for now we're just adding a few before we eat up all the extra
   capacity.
   
   cc rust-lang#38531

   

   alexcrichton committed Jan 4, 2017
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