target-i386: Fix jmp im on x86_64 when executing 32-bit code

When running grub-install (32-bit) on an x86_64 Linux system in qemu, it
hangs on a pagefault forever, because an integer overflow occurs on the
IP on "jmp im". This patch masks overflows for 32 bit IPs on a 64 bit
system, just like it is done for 16 bit IPs already.

Using this patch, x86_64 openSUSE installation works again.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Signed-off-by: NKevin Wolf <kwolf@suse.de>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5963 c046a42c-6fe2-441c-8c8c-71466251a162

target-i386/translate.c

@@ -6165,6 +6165,8 @@ static target_ulong disas_insn(DisasContext *s, target_ulong pc_start)
         tval += s->pc - s->cs_base;
         if (s->dflag == 0)
             tval &= 0xffff;
+        else if(!CODE64(s))
+            tval &= 0xffffffff;
         gen_jmp(s, tval);
         break;
     case 0xea: /* ljmp im */