patch applied (ghc-6.8/ghc): small reworking of the loop-breaker-choosing algorithm

[Ian Lynagh]

Tue Oct  9 07:53:05 PDT 2007  Simon Marlow <simonmar at microsoft.com>
  * small reworking of the loop-breaker-choosing algorithm
  Previously inline candidates were given higher preference as
  non-loop-breakers than constructor applications, but the reason for
  this was that making a wrapper into a loop-breaker is to be avoided at
  all costs.  This patch refines the algorithm slightly so that wrappers
  are explicitly avoided by giving them a much higher score, and other
  inline candidates are given lower scores than constructor
  applications.
  
  This makes almost zero difference to a complete nofib run, so it
  amounts to just a tidyup.

    M ./compiler/simplCore/OccurAnal.lhs -22 +29