Patch for jump optimization

[Jeffrey A Law]

  In message < 19980203000517.65224@dot.cygnus.com >you write:
  > Err, not PATTERN (temp) but 
  > 
  > 	modifued_in_p (PATTERN (insn), temp)
  > 
  > certainly that fixes the immediate problem.
Agreed.  The first arg should be a pattern, the second an actual insn.

I'll go fix it :-)

jeff