Use range instead of xrange whenever possible. The extra list creation in Python2
is generally not a performance bottleneck.
Differential Revision: https://reviews.llvm.org/D56253
llvm-svn: 350309
Make sure all print statements are compatible with Python 2 and Python3 using
the `from __future__ import print_function` statement.
Differential Revision: https://reviews.llvm.org/D56249
llvm-svn: 350307
