Pythran compat - range vs. xrange

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350309 91177308-0d34-0410-b5e6-96231b3b80d8
14 files changed