Commits on Jul 5, 2017

1. Switch to rust-lang-nursery/compiler-builtins …

   This commit migrates the in-tree `libcompiler_builtins` to the upstream version
   at https://github.com/rust-lang-nursery/compiler-builtins. The upstream version
   has a number of intrinsics written in Rust and serves as an in-progress rewrite
   of compiler-rt into Rust. Additionally it also contains all the existing
   intrinsics defined in `libcompiler_builtins` for 128-bit integers.
   
   It's been the intention since the beginning to make this transition but
   previously it just lacked the manpower to get done. As this PR likely shows it
   wasn't a trivial integration! Some highlight changes are:
   
   * The PR rust-lang/compiler-builtins#166 contains a number of fixes
     across platforms and also some refactorings to make the intrinsics easier to
     read. The additional testing added there also fixed a number of integration
     issues when pulling the repository into this tree.
   
   * LTO with the compiler-builtins crate was fixed to link in the entire crate
     after the LTO process as these intrinsics are excluded from LTO.
   
   * Treatment of hidden symbols was updated as previously the
     `#![compiler_builtins]` crate would mark all symbol *imports* as hidden
     whereas it was only intended to mark *exports* as hidden.

   

   alexcrichton committed Jul 5, 2017
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