Ben Gamari authored Apr 22, 2017 and Ben Gamari committed Apr 23, 2017

While debugging an unrelated issue I noticed that we leak a
TimerQueueTimer on exit since we don't necessarily call stopTicker
before exitTicker. Fix this.

Test Plan: Validate on Windows

Reviewers: simonmar, austin, erikd

Reviewed By: simonmar

Subscribers: rwbarton, thomie

Differential Revision: https://phabricator.haskell.org/D3477