[GHC] #8793: Improve GHC.Event.IntTable performance

[GHC]

#8793: Improve GHC.Event.IntTable performance
-------------------------------------+-------------------------------------
        Reporter:  cdk               |                Owner:
            Type:  task              |               Status:  patch
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Core Libraries    |              Version:  7.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by thomie):

 Thanks for picking this up. Could you maybe try submitting your patches to
 [wiki:Phabricator], so the build bot can validate them.

 > A thing I find surprising is the first argument in updateWith.go, which
 seems to be totally unused. Is this the correct behavior?
 Maybe you could tell us? This code was added in
 28cf2e004da0fc809ce9efff0802b125b3501e91 (#8158).

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8793#comment:11>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler