Fix symbol lookup for mips64* targets.

Signed-off-by: Stefan Weil <weil@mail.berlios.de> 

Index: disas.c
===================================================================
--- disas.c	(Revision 5400)
+++ disas.c	(Arbeitskopie)
@@ -309,6 +309,11 @@
     struct syminfo *s;
     target_ulong addr;
 
+#if defined(TARGET_MIPS64)
+    /* Adresses in syminfos are 32 bit values. */
+    orig_addr &= 0xffffffff;
+#endif
+
     for (s = syminfos; s; s = s->next) {
 	sym = s->disas_symtab;
 	for (i = 0; i < s->disas_num_syms; i++) {