[GHC] #7155: Fails to build on powerpc with -Werror : The import of `CmmCallConv' is redundant

[GHC]

#7155: Fails to build on powerpc with -Werror  : The import of `CmmCallConv' is
redundant
------------------------------+---------------------------------------------
 Reporter:  erikd             |          Owner:          
     Type:  bug               |         Status:  new     
 Priority:  normal            |      Component:  Compiler
  Version:  7.4.2             |       Keywords:          
       Os:  Unknown/Multiple  |   Architecture:  powerpc 
  Failure:  None/Unknown      |       Testcase:          
Blockedby:                    |       Blocking:          
  Related:                    |  
------------------------------+---------------------------------------------
 {{{
 compiler/nativeGen/X86/Regs.hs:61:1:
     Warning: The import of `CmmCallConv' is redundant
                except perhaps to import instances from `CmmCallConv'
              To import instances alone, use: import CmmCallConv()

 <no location info>:
 Failing due to -Werror.
 }}}

 One possible solution is something the one propsed in #7083.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7155>
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