We need to convert the python2 scripts to python3.
I suppose this is still an upstream thing, ...?
Patch proposed upstream: https://reviews.llvm.org/D55829.
Note that this patch make the scripts compatible with both Python2 and Python3.
7.0.1 has been shipped with this patch applied.
The pathfix.py use in the spec file should be updated to use python3.
Python compatibility patch merged upstream, and pathfix applied by Miro as of https://src.fedoraproject.org/rpms/llvm-test-suite/pull-request/4