[GHC] #3232: Remove registerised -fvia-C

[GHC]

#3232: Remove registerised -fvia-C
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  Reporter:  igloo             |          Owner:                  
      Type:  task              |         Status:  new             
  Priority:  high              |      Milestone:  6.12.1          
 Component:  Compiler          |        Version:  6.11            
  Severity:  normal            |       Keywords:                  
Difficulty:  Unknown           |       Testcase:                  
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
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 Remove registerised `-fvia-C`.

 The following should be looked at before doing so:
  * x86 floating point performance is bad with `-fasm`

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3232>
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