kanetw authored May 03, 2018 and Ben Gamari committed May 03, 2018

* osNumaNodes now returns the right number of nodes
* thread affinity is now correctly set

TODO: no noticeable performance improvement.
does windows already distribute threads in a NUMA-aware fashion?

Test Plan:
* validate
* local tests on a NUMA machine

Reviewers: bgamari, erikd, simonmar

Reviewed By: bgamari, simonmar

Subscribers: thomie, carter

Differential Revision: https://phabricator.haskell.org/D4607