infinite loop in loop.c with -O2

[Jeffrey A Law]

  In message < 199906211700.SAA28225@phal.cygnus.co.uk >you write:
  > > I too am seeing an infinite loop when bootstrapping.  This is on
  > > x86-linux.  I was compiling regclass.o with stage1, 18hr of CPU time
  > > later...  I was using:
  > > 
  > > File: loop.c            Status: Up-to-date
  > >  
  > >    Working revision:    1.165
  > >    Repository revision: 1.165   /egcs/carton/cvsfiles/egcs/gcc/loop.c,v
  > > 
  > > stage1/xgcc -Bstage1/ -c  -DIN_GCC    -DUSE_GNULIBC_1 -O2  -DHAVE_CONFIG_
  > H    -I. -I../../egcs/gcc -I../../egcs/gcc/config -I../../egcs/gcc/../inclu
  > de ../../egcs/gcc/regclass.c
  > > 
  > > was the command.  It loops while compiling init_reg_sets_1.
  > 
  > The code using find_life_end was bogus.  I've replaced it some time ago,
  > but the patch hasn't been reviewed yet.
Can you extract out just the changes necessary to deal with the fine_life_end
problems.

This is *PRECISELY* why this code is so messed up -- you've got way too many
interdependencies between your patches.  And I will NOT approve a mega-patch.
We do not allow other folks to submit huge mega-patches, we require them to
break them into manageable hunks.  You will need to do the same or we'll have
to pull the recombine_givs and related code out _again_.

jeff