[GHC] #11297: CmmSwitchTest is broken on 32-bit platforms

[GHC]

#11297: CmmSwitchTest is broken on 32-bit platforms
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        Reporter:  bgamari           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Test Suite        |              Version:  7.10.3
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:  CmmSwitchTest
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by avd):

 @bgamari, @thomie, I would like to work on this ticket. I reproduced it
 and already have a patch, need to submit it to Phabricator. Can you make
 me an owner (as https://ghc.haskell.org/trac/ghc/wiki/Phabricator
 requires) or should I do this by myself?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11297#comment:9>
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