patch applied (ghc): merged patches relating to GhcTags from #946

[Simon Marlow]

Mon Jun 25 06:21:58 PDT 2007  Simon Marlow <simonmar at microsoft.com>
  * merged patches relating to GhcTags from #946
  
  * accomodate changes in the GHC API
  * refactoring for more readable source code
  * if the whole group fails, try one file at a time
  * desperate attempts to handle the GHC build

    M ./utils/ghctags/GhcTags.hs -108 +152