[GHC] #5576: Fix to #5549 breaks integerConstantFolding

[GHC]

#5576: Fix to #5549 breaks integerConstantFolding
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    Reporter:  daniel.is.fischer  |       Owner:              
        Type:  bug                |      Status:  new         
    Priority:  normal             |   Component:  Compiler    
     Version:  7.3                |    Keywords:              
    Testcase:                     |   Blockedby:              
          Os:  Linux              |    Blocking:              
Architecture:  Unknown/Multiple   |     Failure:  None/Unknown
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Comment(by daniel.is.fischer):

 Nope. `divMod` and `quotRem` get constant-folded (and T5549 breaks) iff
 `litSize (LitInteger{}) = 0`.[[BR]]
 We need something better to get both goodies.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5576#comment:2>
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