[GHC] #7902: Add support for byte endianness swapping exposed as a primops

[GHC]

#7902: Add support for byte endianness swapping exposed as a primops
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    Reporter:  tab               |       Owner:                  
        Type:  feature request   |      Status:  patch           
    Priority:  normal            |   Milestone:                  
   Component:  Compiler          |     Version:  7.7             
    Keywords:  bswap endianness  |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Comment(by tibbe):

 Patches look good to me.

 You can start a discussion on libraries at haskell.org about how to expose
 these primops through the base package.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7902#comment:9>
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