This involved running 2to3 on it and adjusting all uses of subprocess to use
universal_newlines=True so the output is text instead of binary. It remains
compatible with Python 2.7.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274365 91177308-0d34-0410-b5e6-96231b3b80d8