[GHC] #2988: Improve float-in

[GHC]

#2988: Improve float-in
---------------------------------------------+------------------------------
    Reporter:  simonpj                       |        Owner:                  
        Type:  compile-time performance bug  |       Status:  new             
    Priority:  normal                        |    Milestone:  6.12 branch     
   Component:  Compiler                      |      Version:  6.10.1          
    Severity:  normal                        |   Resolution:                  
    Keywords:                                |   Difficulty:  Unknown         
    Testcase:                                |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple              |  
---------------------------------------------+------------------------------
Changes (by igloo):

  * milestone:  => 6.12 branch

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2988#comment:1>
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