[GHC] #1003: Cleanup: remove old usage stuff from primops.txt and genprimopcode

[GHC]

#1003: Cleanup: remove old usage stuff from primops.txt and genprimopcode
----------------------------+-----------------------------------------------
    Reporter:  simonmar     |       Owner:         
        Type:  task         |      Status:  new    
    Priority:  normal       |   Milestone:  6.8    
   Component:  Compiler     |     Version:  6.6    
    Severity:  normal       |    Keywords:         
  Difficulty:  Easy (1 hr)  |    Testcase:         
Architecture:  Unknown      |          Os:  Unknown
----------------------------+-----------------------------------------------
`primops.txt` still contains declarations for the usage properties of
 primops, although the usage analysis code was removed a long time ago.
 Also `genprimopcode` contains stuff to interpret it.  All this needs
 removing.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1003>
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