remove completely broken escape analysis.
remove completely broken escape analysis.

I noticed that `nth` was being flagged as not safe for
  trcall.  say what?  turns out this broken escape analysis
  was flagging any function called by any escaping function as
  also escaping, which in a large program disables trcall all
  over the place.
The code dates back all the way to the python version, so it's
  been wrong for a long time.

samrushing/irken-compiler,samrushing/irken-compiler,samrushing/irken-compiler,samrushing/irken-compiler