[GHC] #7579: Command line option to suppress LLVM version warning

[GHC]

#7579: Command line option to suppress LLVM version warning
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Reporter:  thoughtpolice     |          Owner:  thoughtpolice   
    Type:  feature request   |         Status:  new             
Priority:  normal            |      Component:  Compiler (LLVM) 
 Version:  7.7               |       Keywords:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
 Failure:  None/Unknown      |      Blockedby:                  
Blocking:                    |        Related:                  
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 When developing I'm sometimes testing the LLVM backend and often it's with
 a development version. In this case I'd like to be able to configure my
 ```mk/build.mk``` to suppress the annoying version constraint warning,
 since I know what llc etc it will use. It makes the build output a lot
 less annoying.

 Attached is a patch. It's undocumented, since it's probably is only useful
 to developers.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7579>
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