patch applied (ghc): Modify the breakpoint desugaring to introduce more laziness

[Pepe Iborra]

Tue Feb 13 12:30:43 PST 2007  Pepe Iborra <mnislaih at gmail.com>
  * Modify the breakpoint desugaring to introduce more laziness
  
  Benchmarks have shown that making the formation of the list of locals more lazy can improve performance of -fdebugging up to 50% in some cases
  

    M ./compiler/deSugar/DsBreakpoint.lhs -1 +3