another gcj crash

[Tom Tromey]

The current cvs gcj crashes while compiling Mauve.  The file it
crashes on is DatagramPacketTest.java.

Stack trace appended.

Tom

Program received signal SIGSEGV, Segmentation fault.
0x80a67fe in list_length (t=0x84d7be4) at ../../egcs/gcc/tree.c:2006
2006      for (tail = t; tail; tail = TREE_CHAIN (tail))
(gdb) bt
#0  0x80a67fe in list_length (t=0x84d7be4) at ../../egcs/gcc/tree.c:2006#1  0x809d793 in compile_file (    name=0xbffffbf7 "../mauve/gnu/testlet/java/net/DatagramPacket/DatagramPacketTest.java") at ../../egcs/gcc/toplev.c:2480
#2  0x80a1f65 in main (argc=9, argv=0xbffffabc) at ../../egcs/gcc/toplev.c:4935
(gdb) p t
$1 = 0x84d7be4
(gdb) p tail
$2 = 0x20
(gdb) p len
$3 = 36