Ben Gamari authored Jan 27, 2016 and Ben Gamari committed Jan 27, 2016

jberthold astutely pointed out that the previous fix (D1822) could not
have possibly fixed the issue as the patch would only have had any
effect if !PROFILING.

Test Plan: Check for reduced CPU usage when compiled with `-prof` but
without `+RTS -p`

Reviewers: simonmar, austin, jberthold

Reviewed By: simonmar, jberthold

Subscribers: simonmar, thomie

Differential Revision: https://phabricator.haskell.org/D1844

GHC Trac Issues: #9105