patch applied (ghc): Refactor TcRnDriver, and check exports on hi-boot files

[Simon Peyton Jones]

Fri Mar 16 06:38:50 PDT 2007  simonpj at microsoft.com
  * Refactor TcRnDriver, and check exports on hi-boot files
  
  This patch refactors TcRnDriver to make the top-level structure
  easier to understand.  
  
  The change was driven by Trac #924, and this patch fixes that bug.
  When comparing a module against its hs-boot file, we must ensure that
  the module exports everything that the hs-boot file exports.
  

    M ./compiler/iface/TcIface.lhs -2 +5
    M ./compiler/rename/RnHsDoc.hs -5 +17
    M ./compiler/rename/RnNames.lhs -27 +40
    M ./compiler/rename/RnSource.lhs -10 +4
    M ./compiler/typecheck/TcRnDriver.lhs -125 +134
    M ./compiler/typecheck/TcRnMonad.lhs -6 +12