dwarfout.c ICE in bootstrap

[Robert Lipe]

OpenServer is now failing to bootstrap.  The failure is reproducable on
Linux, but it takes non-default flags to light up dwarf-1.  Here's the
OpenServer failure:

stage1/xgcc -Bstage1/ -B/usr/local/i686-pc-sco3.2v5.0.5/bin/ -c  -DIN_GCC    -O2
 -g -W -Wall -Wtraditional -Wwrite-strings -Wstrict-prototypes -Wmissing-prototy
pes -pedantic -Wno-long-long  -DHAVE_CONFIG_H    -I. -I../../egcs/gcc -I../../eg
cs/gcc/config -I../../egcs/gcc/../include ../../egcs/gcc/stmt.c
../../egcs/gcc/stmt.c: In function `expand_nl_goto_receiver':
../../egcs/gcc/stmt.c:3473: Internal compiler error in ?, at dwarfout.c:5305
Please submit a full bug report.


This has shown up sometime in the last ten days or so.  (I've been
travelling and the bootstraps have failed for other reasons, so I can't
pinpoint a precise date from the logs.)

On a RH6.2/IA32 box, I am able trigger this failure as well.   The key
flags seem to be the interesection of '-gdwarf' and '-O2'.   This command
will do it.

  stage1/xgcc -Bstage1/ -c  -DIN_GCC -O2 -gdwarf -I. -I/play/egcs/gcc -I/play/egcs/gcc/config -I/play/egcs/gcc/../include /play/egcs/gcc/stmt.c