[GHC] #9067: Optimize clearNursery by short-circuiting when we get to currentNursery

[GHC]

#9067: Optimize clearNursery by short-circuiting when we get to currentNursery
-------------------------------------+-------------------------------------
              Reporter:  ezyang      |            Owner:  ezyang
                  Type:  task        |           Status:  new
              Priority:  low         |        Milestone:
             Component:  Runtime     |          Version:  7.9
  System                             |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:  Runtime     |  Related Tickets:
  performance bug                    |
             Test Case:              |
              Blocking:              |
Differential Revisions:  Phab:D318   |
-------------------------------------+-------------------------------------
Changes (by simonmar):

 * differential:   => Phab:D318


--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9067#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler