[PATCH] D42450: [utils] Convert update_{llc_, }test_checks.py to Python 3

[Fangrui Song via Phabricator via llvm-commits]

MaskRay added a comment.

Thanks for your preference of `python3` over `python2.7`. Is the only objection

1. not out-of-box on Mac OS X
2. inconsistency with other scripts with the shebang (`#!/usr/bin/python` or `python2`)


Repository:
  rL LLVM

https://reviews.llvm.org/D42450