[haskell-platform] #189: Include LLVM tools

[haskell-platform]

#189: Include LLVM tools
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 Reporter:  dterei       |        Owner:  dons    
     Type:  enhancement  |       Status:  new     
 Priority:  major        |    Milestone:  Blue Sky
Component:  Platform     |   Resolution:          
 Keywords:               |  
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Comment(by refold):

 > Including LLVM would be a pretty large undertaking.

 We only need to include a single executable - `llc` (and maybe also
 `opt`). One potential problem is that the user may have already installed
 LLVM separately, so we should be careful not to shadow the system `llc`.

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Ticket URL: <http://trac.haskell.org/haskell-platform/ticket/189#comment:4>
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