[issue29882] Add an efficient popcount method for integers

[Mark Dickinson]

Change by Mark Dickinson <dickinsm at gmail.com>:


----------
pull_requests: +28979
pull_request: https://github.com/python/cpython/pull/30794

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue29882>
_______________________________________