patch applied (ghc): Fix case-merge bug that was breaking the HEAD

[Simon Peyton Jones]

Wed Feb 21 01:11:23 PST 2007  simonpj at microsoft.com
  * Fix case-merge bug that was breaking the HEAD
  
  My re-org of the case-merging transformation introduced a bug, which led
  to incorrect code.   This only showed up occasionally, but it generated
  incorrect code for PprC.pprCastReg in the stage-2 compiler. As a result
  the stage-2 compiler ran without crashing, but itself generated bogus C.
  
  For a change, this is one that Core Lint couldn't find, so the trail was
  a bit longer.  The fix is easy (and commented).
  
  

    M ./compiler/simplCore/SimplUtils.lhs -7 +16