[GHC] #8317: Optimize tagToEnum# at Core level

[GHC]

#8317: Optimize tagToEnum# at Core level
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        Reporter:  jstolarek         |            Owner:
            Type:  task              |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.7
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:  8326
        Blocking:                    |  Related Tickets:  #6135
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Comment (by jstolarek):

 Simon's fix is temporalily commented out, until we solve #8326. Once we've
 done that we have to uncomment the code.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8317#comment:4>
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