llvm dev - Mar 2017 - why is clang-3stage-ubuntu disabled in buildbot/osuosl/master/config/builders.py?

Does anyone know why the clang-3stage-ubuntu build bot is disabled at...

https://llvm.org/svn/llvm-project/zorg/trunk/buildbot/osuosl/master/config/builders.py

On darwin, we seeing non-deterministic behavior in llvm trunk since
4.0.0 was branched off.

http://bugs.llvm.org/show_bug.cgi?id=32342

It would be wise to re-enable that buildbot to get some coverage for
checks on non-deterministic code generation on linux.
       Jack
ps It is unclear if anyone has ever adjusted
tools/clang/cmake/caches/3-stage.cmake to allow it to work on darwin
so the non-deterministic code generation checks using that may have to
be done on linux.