[GHC] #5352: Very slow (nonterminating?) compilation if libraries compiled with -fexpose-all-unfoldings

[GHC]

#5352: Very slow (nonterminating?) compilation if libraries compiled with
-fexpose-all-unfoldings
---------------------------------+------------------------------------------
    Reporter:  batterseapower    |       Owner:                              
        Type:  bug               |      Status:  new                         
    Priority:  normal            |   Component:  Compiler                    
     Version:  7.0.3             |    Keywords:                              
    Testcase:                    |   Blockedby:                              
          Os:  Unknown/Multiple  |    Blocking:                              
Architecture:  Unknown/Multiple  |     Failure:  Compile-time performance bug
---------------------------------+------------------------------------------

Comment(by batterseapower):

 I think the problem is in the tidier or later because the post-float-in
 simplifed Core (of size 16895) is displayed fine if we do -ddump-simpl.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5352#comment:2>
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