elf.c assign_file_positions_for_segments

[Michael Chastain]

Another data point from my test bed:

I just saw the gcore breakage with gcc -gstabs+ on native
i686-pc-linux-gnu.  The problem did not happen with gcc -gdwarf-2.

This was with gdb 2004-09-22 and many different versions of gcc,
gcc 2.95.3 and gcc 3.3.4 and gcc 3.4.2 in particular.

With a current gdb, 2004-09-28, the problem does not happen.
So the fix is all good.

Michael