patch applied (ghc): Add dumping of native code gen stats to file.

[Ben Lippmeier]

Fri Aug 17 07:37:30 PDT 2007  Ben.Lippmeier at anu.edu.au
  * Add dumping of native code gen stats to file.
  
  Compiling module Foo with -ddrop-asm-stats produces a file
  called Foo.dump-asm-stats which will contain increasingly
  interesting information.
  

    M ./compiler/main/CodeOutput.lhs -3 +3
    M ./compiler/main/DynFlags.hs +2
    M ./compiler/nativeGen/AsmCodeGen.lhs -57 +104
    M ./compiler/nativeGen/RegSpill.hs -1 +2