[GHC] #7600: cgrun044 failing with LLVM backend

[GHC]

#7600: cgrun044 failing with LLVM backend
---------------------------------+------------------------------------------
    Reporter:  dterei            |       Owner:  dterei            
        Type:  bug               |      Status:  new               
    Priority:  normal            |   Milestone:                    
   Component:  Compiler (LLVM)   |     Version:  7.7               
    Keywords:                    |          Os:  Unknown/Multiple  
Architecture:  Unknown/Multiple  |     Failure:  Compile-time crash
  Difficulty:  Unknown           |    Testcase:                    
   Blockedby:                    |    Blocking:                    
     Related:  3676              |  
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Changes (by simonpj):

  * difficulty:  => Unknown


Comment:

 I wonder if there is a rewrite RULE for `realToFrac` but not for
 `double2Float`?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7600#comment:3>
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