patch applied (ghc): bump MAX_THUNK_SELECTOR_DEPTH from 8 to 16

[Simon Marlow]

Mon Sep  3 03:19:12 PDT 2007  Simon Marlow <simonmar at microsoft.com>
  * bump MAX_THUNK_SELECTOR_DEPTH from 8 to 16
  this "fixes" #1038, in that the example runs in constant space, but
  it's really only working around the problem.  I have a better patch,
  attached to ticket #1038, but I'm wary about tinkering with this
  notorious bug farm so close to the release, so I'll push it after
  6.8.1.

    M ./rts/sm/Evac.c -1 +1