dwarf bootstrap ICE w/ reduced testcase

[Robert Lipe]

Sometime in the last 2 days, this bug was introduced.  It prevents
OpenServer from bootstrapping.  I've reduced it from frame-dwarf2.c and
have verified that it can be reproduced on i686-pc-linux-gnu.

(robertl) rjlinux:/tmp/gcc
$ cat x.c
struct dwarf_cie
{
   char blah[0];
}
__attribute__ ((packed, aligned (__alignof__ (void *))));
(robertl) rjlinux:/tmp/gcc
$ ./xgcc -B./ -gdwarf x.c
x.c:6: Internal compiler error in field_byte_offset, at dwarfout.c:1940
Please submit a full bug report.
See <URL: http://www.gnu.org/software/gcc/bugs.html > for instructions.


RJL