[GHC] #5169: LLVM backend should warn if llvm tools aren't installed

[GHC]

#5169: LLVM backend should warn if llvm tools aren't installed
---------------------------------+------------------------------------------
    Reporter:  dterei            |       Owner:  dterei         
        Type:  feature request   |      Status:  new            
    Priority:  normal            |   Component:  Compiler (LLVM)
     Version:  7.0.3             |    Keywords:                 
    Testcase:                    |   Blockedby:                 
          Os:  Unknown/Multiple  |    Blocking:                 
Architecture:  Unknown/Multiple  |     Failure:  Other          
---------------------------------+------------------------------------------
Changes (by dterei):

  * failure:  None/Unknown => Other
  * component:  Compiler => Compiler (LLVM)


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5169#comment:2>
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