Mr Kerckhove authored Oct 18, 2017 and Ben Gamari committed Oct 19, 2017

This diff exposes the monotonic time api from GHC.Event.Clock.

This is necessary for future work on regression tests (#D4074) for
the timeout problems (8684, for example) in #D4041, #D4011, #D4012

Test Plan: Still builds ...

Reviewers: nh2, bgamari, austin, hvr

Reviewed By: bgamari

Subscribers: rwbarton, thomie

Differential Revision: https://phabricator.haskell.org/D4079