Release Notes: Add Zig to External Open Source Projects Using LLVM 8

[andrewrk]

Summary

Zig has all tests passing in the llvm8 branch with rc1.
Zig 0.4.0 is scheduled to be released 1 week after LLVM 8.0.0,
and it will depend on LLVM 8.

[hans]

lgtm

Please go ahead and commit directly to the branch, or let me know if you'd like me to do it.

[andrewrk]

Thanks Hans. I'll need you to do it on my behalf as I do not have commit privileges.

llvm/docs/ReleaseNotes.rst

 
 
 Changes to the DAG infrastructure
 ---------------------------------
 
 External Open Source Projects Using LLVM 8
 ==========================================
 
-* A project...
+Zig Programming Language
+------------------------
+
+`Zig <https://ziglang.org>`_  is a system programming language intended to be
+an alternative to C. It provides high level features such as generics, compile
+time function execution, and partial evaluation, while exposing low level LLVM
+IR features such as aliases and intrinsics. Zig uses Clang to provide automatic
+import of .h symbols, including inline functions and simple macros. Zig uses
+LLD combined with lazily building compiler-rt to provide out-of-the-box
+cross-compiling for all supported targets.
 
 
 Additional Information
 ======================
 
 A wide variety of additional information is available on the `LLVM web page
 <https://llvm.org/>`_, in particular in the `documentation
 <https://llvm.org/docs/>`_ section.  The web page also contains versions of the
 API documentation which is up-to-date with the Subversion version of the source
 code.  You can access versions of these documents specific to this release by
 going into the ``llvm/docs/`` directory in the LLVM tree.
 
 If you have any questions or comments about LLVM, please feel free to contact
 us via the `mailing lists <https://llvm.org/docs/#mailing-lists>`_.